Not long ago, 3D Realms (formerly Apogee, not to be confused with the spin-off Apogee) revamped its website and store, including an anthology (several of these games have also been released on GOG.com). A few days ago, after much negotiation with individual rights holders, a Steam version of the anthology (missing Wolfenstein 3D and Commander Keen, which are (apart from two certain Keen titles) already available on Steam via iD/ZeniMax) was released (direct link to store page). Over the years, they have also made a bunch of their titles freeware. After the break, a full list of links to download those free games via their legacy site (apart from two, downloadable elsewhere) in order of original release. Most of the newer ones are also available in the revamped store for registered users (via the same library as game purchases). Those not available via that store will be marked. Oh, and as always, DOSbox is your friend when running old DOS games.
All downloads except Boppin’ and Stargunner are from this page.
Beyond the Titanic (1986) *
Supernova (1987) *
Kroz series (1987) * (note: according to this, the Kroz games are officially seven in number but have a complicated history of aliases and variants, so you may want to read the readme file to make sense of it all)
Trivia Whiz (1988) *
Word Whiz (1988) *
Caves of Thor (1989) *
Adventure and Puzzle Fun-Paks (individual titles: 1986 to 1989 or 1990) *
Pharaoh’s Tomb (1990)
Monuments of Mars (1990)
Arctic Adventure (1991)
Dark Ages (1991) **
Bio Menace (1993)
Major Stryker (1993)
Alien Carnage (1994)
Boppin’ (1994) * (Link is to page where game can be downloaded; click the floppy disk)
Xenophage (1995) **
Stargunner (1996) (original file host no longer exists, DOS Games Archive to the rescue; stargunf.zip is the full version)
* indicates a game not available on 3D Realms’ modern site, ** indicates a game not yet available there but which will be added to its anthology and possibly also as a standalone title
Wolfenstein 3D Super Upgrades, including 815 extra levels, a level generator and a map editor.
Backup of the legacy site’s FTP server on the Internet Archive