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Open Source conferences

80 events catalogued in Open Source, 79 forthcoming across 2026 and 2027, 1 prior. Click any entry for the full editorial profile: speakers, sponsors, sessions, cross-event company graph.

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The best Open Source conferences in 2026 and 2027

Data as of October 8, 2026

10 picks from 79 upcoming Open Source conferences, ranked by verified program depth: the speakers and sponsors each event publishes on its own site. How we verify.

At a glance
#ConferenceDatesWhereSpeakersSponsorsBest for
1J-Fall 2026November 11, 2026Ede, NL12219A broad program of sessions
2OpenSSL Conference 2026October 13, 2026online1080A broad program of sessions
3Lakehouse Day 2026October 10, 2026Glasgow, GB10113A broad program of sessions
4SFSCON 2026November 13, 2026Bolzano, IT8818A deep speaker lineup
5Lambda World 2026October 29, 2026Malaga, ES7541Seeing the vendor landscape
6DevFest Toulouse 2026November 19, 2026Toulouse, FR6559Seeing the vendor landscape
7PostgreSQL Conference Europe 2026October 20, 2026Valencia, ES8714A deep speaker lineup
8Joomla World Conference 2026October 16, 2026Potsdam, DE5939Seeing the vendor landscape
9BaselOne 2026October 14, 2026Basel, CH7212A deep speaker lineup
10OCUDU Ecosystem Developer SummitOctober 20, 2026Alexandria, US644A deep speaker lineup
  1. 1
    J-Fall 2026November 11, 2026

    Ede, NL·122 voices, 19 sponsors

    Best forA broad program of sessions

    122 speakers, 11% at VP level or above. Sponsors include Rabobank, ING and ABN AMRO. About 1,919 attendees expected.

    Track
  2. 2
    OpenSSL Conference 2026October 13, 2026

    Virtual·108 voices

    Best forA broad program of sessions

    108 speakers.

    Track
  3. 3
    Lakehouse Day 2026October 10, 2026

    Glasgow, GB·101 voices, 13 sponsors

    Best forA broad program of sessions

    101 speakers, 11% at VP level or above. Sponsors include AWS, Herodevs and Amazon Web Services.

    Track
  4. 4
    SFSCON 2026November 13, 2026

    Bolzano, IT·88 voices, 18 sponsors

    Best forA deep speaker lineup

    88 speakers. Sponsors include Bosch, Checkmk and Linaro.

    Track
  5. 5
    Lambda World 2026October 29, 2026

    Malaga, ES·75 voices, 41 sponsors

    Best forSeeing the vendor landscape

    75 speakers, 15% at VP level or above. Sponsors include Prima, Leo Vegas and Medida.

    Track
  6. 6
    DevFest Toulouse 2026November 19, 2026

    Toulouse, FR·65 voices, 59 sponsors

    Best forSeeing the vendor landscape

    65 speakers, 17% at VP level or above. Sponsors include Google, Elastic and Capgemini.

    Track
  7. 7

    Valencia, ES·87 voices, 14 sponsors

    Best forA deep speaker lineup

    87 speakers. Sponsors include Microsoft, Google Cloud and EDB.

    Track
  8. 8

    Potsdam, DE·59 voices, 39 sponsors

    Best forSeeing the vendor landscape

    59 speakers, 33% at VP level or above. Sponsors include JoomShaper, YOOtheme and mittwald.

    Track
  9. 9
    BaselOne 2026October 14, 2026

    Basel, CH·72 voices, 12 sponsors

    Best forA deep speaker lineup

    72 speakers, 13% at VP level or above. Sponsors include BLKB, Java Users Group Switzerland and CSS. About 310 attendees expected.

    Track
  10. 10

    Alexandria, US·64 voices, 4 sponsors

    Best forA deep speaker lineup

    64 speakers. Sponsors include Hitachi, Akamai and Neo4j.

    Track

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Questions

About Open Source conferences

What are the best Open Source conferences in 2026?
Ranked by how many speakers and sponsors each event lists on its own site, the top three are J-Fall 2026 (November 11, 2026, Ede, NL), OpenSSL Conference 2026 (October 13, 2026, online) and Lakehouse Day 2026 (October 10, 2026, Glasgow, GB). The ranking above covers 10 events out of 79 upcoming Open Source conferences we track.
Which Open Source conference has the most sponsors?
DevFest Toulouse 2026 lists 59 sponsors, the most of any upcoming Open Source conference we track. It runs November 19, 2026 in Toulouse, FR.
When is the next Open Source conference?
DevFest Milano 2026 is next, on October 10, 2026 in Milano, IT.
Which Open Source conferences are accepting speakers?
Calls for speakers are open at Infonoms 2026 (until October 15).
How is this list ranked?
By verified program depth: the number of speakers and sponsors each conference publishes on its own website, which we re-check against the source. No event pays to appear in this ranking.