Programming

Tcl/Tk A powerful scripting language that makes programming fun and easy.
Microsoft Visual Studio Express Editions are free versions of the products of Microsoft Visual Studio - includes free versions of Visual Basic, Visual C++, Visual C#, Visual Web Developer, Microsoft SQL Server, and Visual J#.
FreeBASIC is a free BASIC compiler.
WebSphere Application Server Community Edition V2.0 is a pre-integrated, lightweight Java Platform, Enterprise Edition (Java EE) 5 application server built on Apache Geronimo technology. Available at no charge.
DB2 Express-C 9 is a no-charge version of DB2 Express 9 data server. DB2 Express-C offers the same core data server features as DB2 Express Edition and provides a solid base to build and deploy applications developed using C/C++, Java, .NET, PHP, and other programming languages.
Rational Application Developer for WebSphere Software is a trial version of Rational Application Developer that helps developers quickly design, develop, analyze, test, profile, and deploy high-quality Web, SOA, Java, J2EE, and portal applications.
Alice is a free teaching tool for introductory computing. It uses 3D graphics and a drag-and-drop interface to facilitate a more engaging, less frustrating first experience in using object-oriented programming.
LunaRCP is an open source project providing very useful plug-ins to ease the development of Eclipse Rich Client Platform (RCP) applications. It covers a broad range of RCP topics, e.g. application startup, file operations, jobs API, SWT/JFace, database integration using Hibernate, etc. LunaRCP is hosted on SourceForge.net.