The New Releases page lists all files hosted in the Museum of ZZT's file archives sorted by release date. This is essentially a full list of all files hosted in chronological order of release excluding unpublished worlds (which may be found on the Upload Queue page).
For many files these dates may not be completely accurate. In instances where the release date cannot be determined with reasonable accuracy, "Unknown" is used instead.
Plastic! Retrofreedom was the final release of Plastic!, and utilized a .pworld file format incompatible with the previous .pgf file format.