(There's no video for WebSTAR plug-ins compilation yet. Please contribute to MR and add a video now!)
Here are some popular WebSTAR plug-ins that added functionality to that web server:
WebSTAR_Plug-Ins.sit (1.63 MiB / 1.71 MB)
WebSTAR plug-ins / compressed w/ Stuffit
Most of these plug-ins work under WebSTAR 2.x which was released near the year 1996, altough some may actually require a newer version of WebSTAR since they were released near the year 2000.
Emulating this? It should run fine under: SheepShaver