Newell funded and hired Logicware to work on the project. Heineman claims that someone at Apple overestimated the number of units of the game would sell and told Gabe Newell that they can sell half a million units. According to Rebecca Heineman, a programmer on the project, the work on the game was nearly done, and it was three weeks away from the gold master when it was cancelled on October 19, 1999. Unrelated to the Mac OS X version that was ultimately released by Valve in 2013, the Macintosh (Mac OS) port of Half-Life was announced to be in development by Logicware on April 23, 1999. Both games were later ported to Mac OS X and Linux and released in 2013. The multiplayer portion was released in another package called Half-Life Deathmatch: Source in 2005. According to Doug Lombardi, it began as an experiment to see what modders would experience if they attempted to bring their Half-Life mods forward to Source. It uses the special effects and physics engine features of the new engine. It was released along with Half-Life 2 on November 16, 2004. Half-Life: Source is a direct port of Half-Life to the Source engine.

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