Clean object-oriented & layered architecture
Automatic frontend engine for Java
Ada Class Library - an object orientated library for Ada.
Delphi : VRCalc++ OOSL & + (Paged List, TextEditor, VRAstroVision ...)
Simple ⇒ Object-Oriented ⇒ Functional
A fat-free DIY Python plugin management toolkit.
Publish/Subscribe, Request/Reply Messaging API for Java.
Single sided linked list (kind of lib with test-code, C, C++ and java)
https://github.com/citerus/dddsample-core
Cross-platform C++ library for use as a default application framework.
The Umple Model-Oriented Programming Technology
Object Oriented tools for C
Cross Platform GUI Toolkit
Dynamic Python binding for Qt Applications
Eclipse Plugin to find unused Java code