Databases

GemStone/S
A platform for developing, deploying, and managing scalable, high-performance, multi-tier applications based on business objects.
http://www.gemstone.com/products/smalltalk/

MinneStore
Free object-oriented database management system for Dolphin Smalltalk/98, Visual Smalltalk, VisualAge Smalltalk, VisualWorks Smalltalk, Squeak. Provides storage and retrieval of complex Smalltalk objects.
http://minnestore.sourceforge.net/

Objectivity/Smalltalk
Makes interface to Objectivity/DB ODBMS fully transparent to Smalltalk developers. Database software library that links with the application program instead of using separate data server process.
http://www.objectivity.com/pages/objectivity/smalltalk.asp

VOSS
Adds transparent persistent object transaction processing to Smalltalk, allowing the application developer to concentrate on the application rather than the mechanics of storage.
http://voss.logicarts.com/