• Inform 7 – Cross-platform, English-based game authoring environment
• Baf’s Guide to the IF Archive – A ton of downloadable IF games
• Abandonia Download link for Planetfall
• Infocom – Zork downloads
• BBC Radio 4 – Play the Hitchhiker’s Guide game
• My github repo – The source of the sample game we played
• Inform 7 IF interpreters – List of interpreters you can use to play these games
• TADS – Another game creation engine

As a side-note: Some of these games come with old DOS executables. You can safely ignore most of those and just use your interpreter to load the z-machine code.

If you have any more IF-related links you’d like to share, post them as a comment!