| Title |
Orig. free date |
License change date |
Initial free license |
Non-free license |
Forked replacement |
Notes |
| Akka |
2009 |
2022 |
Apache-2.0 |
Business Source License[1][2] |
|
|
| ArangoDB |
2011 |
2023 |
Apache-2.0 |
Business Source License[3] |
|
|
| Aseprite |
2001 |
2016 |
GPL-2.0 |
EULA that permits personal use but forbids redistribution[4] |
LibreSprite |
|
| CockroachDB |
2015 |
2019 |
Apache-2.0 |
Business Source License[5] |
|
|
| Consul |
2014 |
2023[6] |
MPL-2.0 |
Business Source License[6] |
|
|
| Couchbase Server |
2010 |
2021 |
Apache-2.0 |
Business Source License[7] |
|
|
| Couchbase Mobile |
|
2022[8] |
Apache-2.0 |
Business Source License[8] |
|
|
| Elasticsearch |
2010 |
2021 |
Apache-2.0 |
"Elastic License" and Server Side Public License[9][10][11] |
OpenSearch |
Added AGPL v3.0 on 29 August 2024[12] |
| Emby |
2014 |
2018 |
GPL-2.0 |
Source code closed on December 8, 2018.[13] |
Jellyfin |
|
| FBReader |
2013 |
2015 |
GPL-2.0-or-later |
Apparently the number of devs was limited, and they all agreed to relicense it.[citation needed] |
|
|
| LiveCode |
2013 |
2021[14] |
GPL-3.0-only |
proprietary[14] |
|
The Livecode company developed it, ran a Kickstarter campaign to GPL it, ran it for eight years open source, and then relicensed it back to proprietary, saying there were few other contributors, most were using the free GPL version, and they couldn't sustain the project.[14] |
| LiveJournal |
1999 |
2014 |
GPL-2.0-or-later |
The source code was made private in 2014. |
Dreamwidth |
|
| MetaMask |
2016 |
2020 |
MIT |
Custom proprietary "non-commercial use only" license.[15] |
|
|
| MongoDB |
2009 |
2018 |
AGPL-3.0-only |
Server Side Public License[16][17] |
|
|
| Nexuiz |
2005 |
2012 |
GPL-2.0-or-later |
Game abandoned in favour of a commercial video game of the same name, which licensed the Nexuiz title but is not based on its engine. |
Xonotic[18] |
|
| OctoberCMS |
2014 |
2021 |
MIT |
Cited the sustainability of its open source model as a factor.[19] |
Winter[20][21] |
|
| OTRS |
2001 |
2020 |
GPL-3.0-or-later |
Support for the Community Edition dropped on December 23, 2020,[22] |
Znuny |
|
| Paint.NET |
2004 |
2007 |
MIT |
freeware license that prohibits modification or resale[23] |
|
|
| PyMOL |
2000 |
2010 |
MIT-CMU[24] |
[25][26][27][28] |
|
|
| Reddit |
2008 |
2017 |
CPAL-1.0 |
Source code was made private in 2017, as the internal codebase had already diverged significantly from the public one. |
|
|
| Redis |
2009 |
2024 |
BSD-3-Clause |
dual: custom license and Server Side Public License[29] |
Valkey[30] |
Added AGPL v3.0 on 1 May 2025.[31] Vadim Tkachenko (co-founder of Percona) doesn't expect this move to affect Valkey, as the de facto purpose of the AGPL "appears to be creating barriers for public cloud providers, which likely guarantees that major sponsors like Amazon and Google will continue to support Valkey."[32] |
| Sourcegraph |
2013 |
2023 |
Apache-2.0 |
proprietary[33] |
|
|
| Terraform |
2014 |
2023[6] |
MPL-2.0 |
Business Source License[6] |
OpenTofu[34] |
HashiCorp founder considered the OpenTofu fork "tragic for open source innovation."[35] |
| Tux Racer |
2000 |
2002 |
GPL-2.0-or-later |
Commercial expansion by original authors, also called Tux Racer. |
Extreme Tux Racer (formerly PlanetPenguin Racer) |
|
| Vagrant |
2010 |
2023[6] |
MIT |
Business Source License[6] |
|
|
