[MrFlibble]

There has been another recent release of LibreQuake, version 0.07. There are new, fully functional models for the Death Knight and the Shambler, plus the zombie is now fully animated. More textures, more sound effects and some new and tweaked maps too.

[NNC]

The Super Marisa Land series (Super Marisa Land, New Super Marisa Land and Marisa Land Legacy) are competent alternatives to the classic Super Mario Bros style.

NSML in particular, is awesome and comparable in scope to the likes of SMB3 or SMW. MLL is not even a freeware game, it's a Steam product, although far from as good as NSML.

EDIT: I already mentioned this in a 2017 post...