Hack

Inspired game: NetHack

Half-Life

Inspired game: FreeHL

Hammer of Thyrion

Inspired game: HHexen

Hardwar

Inspired game: Hardwar

Head over Heels

Inspired game: Head over Heels

Hedgewars

Inspired game: Hase

Heretic

Inspired games: Chocolate Doom, Doom Legacy, DOOM-iOS, Doomsday Engine, EDGE, GZDoom, Mocha Doom, Odamex, PrBoom+, The Eternity Engine, Zandronum, ZDoom

Heroes of Might and Magic II

Inspired game: Free Heroes 2

Heroes of Might and Magic III

Inspired games: Ancient Beast, FreeHeroes, OpenHoMM, VCMI

Hexen

Inspired games: Chocolate Doom, Doom Legacy, DOOM-iOS, Doomsday Engine, GZDoom, Mocha Doom, Odamex, PrBoom+, The Eternity Engine, Zandronum, ZDoom

Hexen II

Inspired games: FTE QuakeWorld, FTEQW, Hammer of Thyrion

Highway Encounter

Inspired game: Vorton

Hogs of War

Inspired game: OpenHoW

Hotline Miami

Inspired game: Hypersomnia

HoverRace

Inspired game: HoverRace

Hovertank 3D

Inspired games: Hovertank 3D, Robot Redemption

HuniePop

Inspired game: OceanPop