Free offers come and go, and many filters are no longer offered (Swatch Buckler?) or don't work in the latest versions of AE. Here's a few others that also seem available, glancing through the AE Portal plug-in summary, but mileage does vary according to the platform and version of AE you're using:
- ObviousFX Erodilation
- Philipp-Spoeth Sinedots I & II, Shear, Retrodots
- Fristschluft Field Fixer & HSL Selection
- Alpha Fir Tree & Ornament
- FAN XMult (like Knoll Unmult)
- Conoa FreeStreak (in the demo of SuperPak)
Update: for new info regarding CS5 compatibility see Free After Effects plug-ins: an inconvenient truth.