The Initial State

This homebrew parser game from 2006 works a little better than others. It has easily readable source, which helps, especially when divining what verbs are allowed. It doesn't do disambiguation well, but everything else is passable.

You wake up in a space station with amnesia, discovering logs and evidence of what has come before.

This is a grimdark game, with mentions of topics like (Spoiler - click to show)frequent contemplation of suicide and enforced rape. It's pessimistic and sad.