North and South America

• Atlanta LinuxFest September
• Calgary LinuxFest held in Calgary, Canada in October
• FISL - Free Software International Forum, held each year in Porto Alegre, Brazil (7000+ participants)
• Florida Linux Show, held in Orlando, Florida in October
• Free Software and Open Source Symposium
  Free Software and Open Source Symposium
  Seneca's Free Software and Open Source Symposium is a yearly event at Seneca College, Canada. As the name suggests, the focus is on Free and Open Source software. Run by faculty, this event is a maintstay on many student's calendars and people from the IT industry...
  
   (FSOSS), held at Seneca College
  Seneca College
  Seneca College of Applied Arts and Technology is a Canadian public college in the greater Toronto area. Seneca College is currently Canada's largest college with approximately 108,000 students.-History:...
  
  , Toronto
  Toronto
  Toronto is the provincial capital of Ontario and the largest city in Canada. It is located in Southern Ontario on the northwestern shore of Lake Ontario. A relatively modern city, Toronto's history dates back to the late-18th century, when its land was first purchased by the British monarchy from...
  
   each October
• GCC Summit
  GCC Summit
  The GCC Summit is an annual conference for developers of the GNU Compiler Collection and related free software technologies. The conference is a 3-day event and has been held each year since 2003...
  
   held in Ottawa
  Ottawa
  Ottawa is the capital of Canada, the second largest city in the Province of Ontario, and the fourth largest city in the country. The city is located on the south bank of the Ottawa River in the eastern portion of Southern Ontario...
  
  , Canada
  Canada
  Canada is a North American country consisting of ten provinces and three territories. Located in the northern part of the continent, it extends from the Atlantic Ocean in the east to the Pacific Ocean in the west, and northward into the Arctic Ocean...
  
  
• Indiana LinuxFest, held in Indianapolis, Indiana
  Indianapolis, Indiana
  Indianapolis is the capital of the U.S. state of Indiana, and the county seat of Marion County, Indiana. As of the 2010 United States Census, the city's population is 839,489. It is by far Indiana's largest city and, as of the 2010 U.S...
  
   in March.
• Linuxfest Northwest
  Linuxfest Northwest
  LinuxFest Northwest is an annual technology conference and expo held in Bellingham, Washington. It is a Saturday and Sunday weekend event held in late April...
  
  , held in Bellingham, Washington
  Bellingham, Washington
  Bellingham is the largest city in, and the county seat of, Whatcom County in the U.S. state of Washington. It is the twelfth-largest city in the state. Situated on Bellingham Bay, Bellingham is protected by Lummi Island, Portage Island, and the Lummi Peninsula, and opens onto the Strait of Georgia...
  
   (80 miles north of Seattle) in the spring
• Linux Plumbers Conference in Portland, Oregon in September
• O'Reilly Open Source Convention
  O'Reilly Open Source Convention
  The O'Reilly Open Source Convention is an annual convention for the discussion of free and open source software. It is organized by the publisher O'Reilly Media and is held each summer in the United States.-Notable events:...
  
  , held each summer in the US
• Ohio LinuxFest
  Ohio LinuxFest
  The Ohio LinuxFest is an annual technology conference and expo held in Columbus, Ohio. The event is dedicated to discussion and development of the Linux operating system and other open source software projects...
  
  , held in Ohio
  Ohio
  Ohio is a Midwestern state in the United States. The 34th largest state by area in the U.S.,it is the 7th‑most populous with over 11.5 million residents, containing several major American cities and seven metropolitan areas with populations of 500,000 or more.The state's capital is Columbus...
  
  
• Ontario Linux Fest
  Ontario Linux Fest
  The Ontario Linux Fest is an annual grass roots conference organized by Linux and Open Source enthusiasts for Linux and Open Source enthusiasts. The event debuted on October 13th, 2007....
  
  , held in Toronto
  Toronto
  Toronto is the provincial capital of Ontario and the largest city in Canada. It is located in Southern Ontario on the northwestern shore of Lake Ontario. A relatively modern city, Toronto's history dates back to the late-18th century, when its land was first purchased by the British monarchy from...
  
  , Ontario in the autumn
• Linux Symposium
  Linux Symposium
  The Linux Symposium is a Linux and Open Source conference held annually in Canada. It features 100+ paper presentations, tutorials, birds of a feather sessions and mini summits on a wide range of topics...
  
  , held in Canada
  Canada
  Canada is a North American country consisting of ten provinces and three territories. Located in the northern part of the continent, it extends from the Atlantic Ocean in the east to the Pacific Ocean in the west, and northward into the Arctic Ocean...
  
   in June or July
• SouthEast LinuxFest (SELF) is held in June.
• Southern California Linux Expo
  Southern California Linux Expo
  The Southern California Linux Expo is an annual Linux, Open-Source, and Free Software conference held in Los Angeles, CA. SCALE grew out of a series of LUGFests put on by the Simi Conejo Linux Users Group in the late 90s. There were four of them, held every 6 months at the Nortel development...
  
   (SCALE) is held in Los Angeles, CA each February
• Texas LinuxFest in Austin, Texas in April.
• USENIX Annual Technical Conference
  USENIX Annual Technical Conference
  The USENIX Annual Technical Conference is a conference of computing professions sponsored by the USENIX association. The conference includes computing tutorials, and a single track technical session for presenting refereed research papers, SIG meetings, and BoFs.There have been several notable...
  
   June
• Embedded Linux Conference, San Francisco in April

Europe

• FOSDEM
  FOSDEM
  FOSDEM is a non-commercial volunteer organized European event centered around free and open source software development. It is aimed at developers and anyone interested in the free and open source software movement...
  
  , held in Brussels, Belgium every February
• Linux Bier Wanderung
  Linux Bier Wanderung
  The Linux Beer Hike is a week-long event which takes place in a different European country each summer, drawing together Open Source software enthusiasts from more than a dozen different countries, for a combination of talks, presentations, hands-on mini-projects, outdoor exercise, and good food...
  
  , held in a different European country every summer
• Linux Days Luxembourg, held in Luxembourg
  Luxembourg
  Luxembourg , officially the Grand Duchy of Luxembourg , is a landlocked country in western Europe, bordered by Belgium, France, and Germany. It has two principal regions: the Oesling in the North as part of the Ardennes massif, and the Gutland in the south...
  
   every February
• Linux Kongress
  Linux Kongress
  The Linux Kongress is an annual two-day conference of Linux developers from around the world. It has taken place since 1994, when Linux was in the early stages of development, and has except 2001 and 2007 always occurred in Germany. Linux-Kongress is one of the three major international...
  
  , held in Germany
  Germany
  Germany , officially the Federal Republic of Germany , is a federal parliamentary republic in Europe. The country consists of 16 states while the capital and largest city is Berlin. Germany covers an area of 357,021 km2 and has a largely temperate seasonal climate...
  
   in the autumn
• LinuxTag
  LinuxTag
  LinuxTag is a Free Software expo with an emphasis on Linux , held every summer in Germany. It is relatively large, claiming that it is the largest expo of this kind in Europe, drawing visitors from many countries....
  
  , held in Germany
  Germany
  Germany , officially the Federal Republic of Germany , is a federal parliamentary republic in Europe. The country consists of 16 states while the capital and largest city is Berlin. Germany covers an area of 357,021 km2 and has a largely temperate seasonal climate...
  
   every summer
• Chemnitzer Linux-Tage held in Chemnitz, Germany in the spring
• Open Source Days, held in Denmark
  Denmark
  Denmark is a Scandinavian country in Northern Europe. The countries of Denmark and Greenland, as well as the Faroe Islands, constitute the Kingdom of Denmark . It is the southernmost of the Nordic countries, southwest of Sweden and south of Norway, and bordered to the south by Germany. Denmark...
  
   every autumn
• Linux Vacation / Eastern Europe
  Linux Vacation / Eastern Europe
  Linux Vacation / Eastern Europe is the annual international conference of developers and users of free and open source software. It takes place in the end of June - beginning of July in Belarus, near the Hrodna city....
  
   held in Belarus
  Belarus
  Belarus , officially the Republic of Belarus, is a landlocked country in Eastern Europe, bordered clockwise by Russia to the northeast, Ukraine to the south, Poland to the west, and Lithuania and Latvia to the northwest. Its capital is Minsk; other major cities include Brest, Grodno , Gomel ,...
  
   every summer
• Linux Konferenca, held in Slovenia
  Slovenia
  Slovenia , officially the Republic of Slovenia , is a country in Central and Southeastern Europe touching the Alps and bordering the Mediterranean. Slovenia borders Italy to the west, Croatia to the south and east, Hungary to the northeast, and Austria to the north, and also has a small portion of...
  
   every September since 2002
• Embedded Linux Conference Europe, held in a different European country every autumn
• Free Software and Linux Days, held in Turkey
  Turkey
  Turkey , known officially as the Republic of Turkey , is a Eurasian country located in Western Asia and in East Thrace in Southeastern Europe...
  
   every April-May since 2002
• FSCons
  FSCONS
  FSCONS is a Nordic conference trying to bridge the gap between software and cultural freedom held each autumn in Gothenburg, Sweden...
  
  , held in Göteborg, Sweden
• Fosscomm
  Fosscomm
  FOSSCOMM is a Greek conference aiming at Open Source enthusiasts, developers, and communities. It has been hosted in various cities around Greece and its goal is to promote the use of FOSS in Greece and get FOSS enthusiasts in together.-Structure:The event runs during a weekend, and includes...
  
  , held annually in a different Greek
  Greece
  Greece , officially the Hellenic Republic , and historically Hellas or the Republic of Greece in English, is a country in southeastern Europe....
  
   city

Asia, Australia and Oceania

• linux.conf.au
  Linux.conf.au
  linux.conf.au is Australasia's regional Linux and Open Source conference. It is a roaming conference, held in a different city every year, coordinated by Linux Australia and organised by local volunteers....
  
  , held in Australia
  Australia
  Australia , officially the Commonwealth of Australia, is a country in the Southern Hemisphere comprising the mainland of the Australian continent, the island of Tasmania, and numerous smaller islands in the Indian and Pacific Oceans. It is the world's sixth-largest country by total area...
  
   or New Zealand
  New Zealand
  New Zealand is an island country in the south-western Pacific Ocean comprising two main landmasses and numerous smaller islands. The country is situated some east of Australia across the Tasman Sea, and roughly south of the Pacific island nations of New Caledonia, Fiji, and Tonga...
  
   in the (Southern Hemisphere) summer
• FOSS.IN
  FOSS.IN
  FOSS.IN is a Free and Open Source Software conference, held in India. It is the successor of the FOSS conferences known as Linux Bangalore , and is one of the largest annual FOSS events in Asia...
  
  
• Freed.in
• OSDC

International

• Gelato ICE, held each year in the US or Italy by the Gelato Federation
  Gelato Federation
  The Gelato Federation is a "global technical community dedicated to advancing Linux on the Intel Itanium platform through collaboration, education, and leadership." Formed in 2001, membership includes more than seventy academic and research organizations around the world, including several that...
  
  
• DebConf
  Debconf
  DebConf is the yearly conference where Debian developers meet to discuss issues around the further development of the system.Besides the scheduled workshops and talks, Debian developers take the opportunity to hack on the Debian system in a more informal setting...
  
  
• Desktop Developers' Conference
  Desktop Developers' Conference
  The Desktop Developers' Conference is a Linux conference where developers discuss and work on X11, Linux desktops like GNOME and KDE, FreeDesktop.org projects, and desktop software such as web browsers, office suites, and groupware...
  
  
• Libre Graphics Meeting
  Libre Graphics Meeting
  The Libre Graphics Meeting is an annual convention for the discussion of free and open source software used with graphics; The first Libre Graphics Meeting was held in May 2006. Communities from Inkscape, GIMP, Krita, Scribus, sK1, Blender, Open Clip Art Library, Open Font Library, and more come...
  
  , held each year in May in Europe or Canada
• Linux Kernel Developers Summit
  Linux Kernel Developers Summit
  The Linux Kernel Developers Summit is an annual gathering of the top Linux kernel developers. Attendance at the summit is by invitation only, and the conference was first held in San Jose in March, 2001...
  
  

Commercial conferences

• OpenSource World (formerly LinuxWorld Conference and Expo
  LinuxWorld Conference and Expo
  OpenSource World is a conference and trade show that focuses on open source and Linux solutions in the information technology sector.The show is owned and managed by IDG World Expo, a business unit of International Data Group...
  
  ), Brazil / Canada / Beijing, China / Guangzhou, China / Shanghai, China / Germany / Italy / Japan / Korea / Malaysia / Mexico / Poland / Russia / Singapore / South Africa / Spain / Sweden / The Netherlands / United Kingdom / Boston, USA / San Francisco, USA
• OSI Days 2010, September 19-21, Chennai India (formerly known as "LinuxAsia Conference and Expo and "Open Source Week"", held in India
  India
  India , officially the Republic of India , is a country in South Asia. It is the seventh-largest country by geographical area, the second-most populous country with over 1.2 billion people, and the most populous democracy in the world...
  
  )
• Open Source Business Conference (OSBC) held in the US every spring
• Open Source in Mobile, held in a different European country every September