For open source, SQLite has pledged long term support through 2050: https://www.sqlite.org/lts.html https://www.sqlite.org/lts.html I imagine it will go on for

For open source, SQLite has pledged long term support through 2050: https://www.sqlite.org/lts.html https://www.sqlite.org/lts.html I imagine it will go on for much longer, though!