- Speculative Search Game
- Stabilizer Bug Reporter
- Affinicast
- Alexa
- Aristotle: Automatic Categorization of Web Resources
- Bayesian Clustering for Collaborative Filtering (Heckerman and Breese)
- Beehive
- Boston Restaurant Guide
- ComMentor
- Group Asynchronous Browsing (GAB) on the World Wide Web
- GroupLens
- Bellcore Recommending Activities (Rosenstein)
- Fab
- Firefly
- Gustos
- Imana/Talisman/SiteSeer
- Learning Information Retreival Agents (PostScript)
- LikeMinds
- Linxx (in German)
- Morse: a Movie Recommendation System
- Movie Critic
- MovieFinder
- MyLinx
- NetAngels
- Net Shephard (a PICS-based system)
- Phoaks (Hill)
- PICS press reelase
- PICS
- Pointers in Context
- SEPIA Video Guide
- The Similarities Engine
- Trabble: Personalized Restaurant Recommendations
- WebBird
- Webhunter
- Web Researcher
- WebWatcher
- Yenta: a matchmaking system
