Don't forget all the opensource ports/engine recomps that (still) work great on Linux:

- OpenJazz (port of Jazz Jackrabbit)

- OpenOMF (One Must Fall 2097)

- OpenMW (Morrowind)

- Devilution X (Diablo)

- SDLPoP (Prince of Persia)

- RVGL (Re-Volt)

- R.E.L.I.V.E. (Abe's Oddysee)

- Ship of Harkinian (Zelda OoT)

- 2Ship2Harkinian (Zelda Majora's Mask)

- Super Mario Bros Remastered

... and probably lots more that I missed out.