Some Stack Exchange sites have a 'sponsored by' logo just under the top bar:
Which sites in the network are/were sponsored, by which company/organization/product and when did that start?
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These sites in the network are sponsored through the formal site sponsorship program:
|Site||Company||Start date||End date|
|Salesforce||Gearset||July 1, 2021||September 30, 2022|
|Database Administrators||AWS||September 27, 2021||December 31, 2022|
|Super User||AWS||September 27, 2021||December 31, 2022|
|Unix & Linux||AWS||September 27, 2021||December 31, 2022|
|Information Security||Auth0||April 21, 2022||December 31, 2022|
|Artificial Intelligence||AWS||July 18, 2022||December 31, 2022|
|Cross Validated||AWS||July 18, 2022||December 31, 2022|
|Data Science||AWS||July 18, 2022||December 31, 2022|
|Server Fault||AWS||July 18, 2022||December 31, 2022|
|Ask Different||AWS||July 22, 2022||December 31, 2022|
|Ask Ubuntu||AWS||July 22, 2022||December 31, 2022|
|Web Applications||AWS||July 22, 2022||December 31, 2022|
Additionally, three sites are sponsored informally, under special agreements that were negotiated before SE launched the formal site sponsorship program:
|Ask Ubuntu||Canonical (more information)||October 11, 2010|
|Ask Patents||U.S. Patents & Trademarks Office||September 20, 2012|
|CS50||edX||somewhere before May 2014|
The following sites have been sponsored in the past:
Unix & Linux, by IBM, started February 4th, 2021, and ended within three months (May 3rd, 2021 in Wayback Machine shows no IBM banner).
DevOps, by New Relic, starting July 31st, 2020, for a period of three months (but was seemingly extended until December 17, 2020; December 18, 2020 in Wayback Machine shows no New Relic banner). On January 7, 2021, the sponsorship was extended for another three months, from January through March 2021 (April 10, 2021 in Wayback Machine shows no New Relic banner).
Other edX course forum sites (now closed), by edX, until about April 2014.