Voyager is a collection of parser-based text adventures for Windows, presented using the Flashpoint Launcher and packed with several interpreters to play them out of the box.

There are a little over 500 freely-distributed adventures here, taken from lots of sources.
Games are double click to play, with all the difficult parts taken care of. Compatibility is not guaranteed but should still be high.
Install is easy; just run the executable, pick a directory, go to the new Voyager directory in that directory, and run the shortcut.

The only difference between "Compact" and "Full" is that the music for Cryptozookeeper isn't included in Compact due to nearly doubling the size of the pack.

Compact (610MB) Full (1050MB)

Contact me at flashpoint at bluemaxima dot org.