- Ingres (RDBMS from UC Berkeley)
- Postgres (Extensible RDBMS from UC Berkeley)
- Mariposa (Distributed DBMS from UC Berkeley)
- Exodus (Extensible DBMS from U Wisconsin, Madison )
- EOS (AT&T Bell Labs' Storage Manager)
- ODE (OODBMS from AT&T Bell Labs)
- VODAK (OODBMS from GMD-IPSI, Germany) Web Page
- MiniSQL(Hughes Technology, Australia)
- W3-mSQL(World Wide Web gateway to MiniSQL)
- OBST (OODBMS from FZI, Karlsruhe, Germany)
- Texas Persistent Store (U Texas, Austin)
- LINCKS (OODBMS from Linkoping University, Sweden)
- LEAP (Relational algebra based RDBMS, educationally oriented)
- Rock&Roll (Deductive OODBMS from Heriot-Watt University, Edinburgh, UK)
- Baegle SQL
- DBasics Shareware
- Miscellaneous Data Management Shareware
- Catalog of Free Database Systems (ftp version)
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