Check out these sites for all sorts of cool open-source tools and reusable software components.

Development Tools

• The Grasp tool.: Graphical Representation of Algorithms, Structures, and Processes. This is actually a wonderful multilanguage, multiplatform program editor.
   
• RAPID is Martin Carlisle's great GUI builder for Ada GUI's using Tcl/Tk.
   
• AdaGIDE is Martin Carlisle's editor/development environment for Ada 95 programs under Windows. This is included in the standard GNAT distribution for Windows but is also available separately, and is sometimes updated between GNAT releases.
   
• OC Systems' Ada Tools : Even if the only computing hardware you have is an 80386-based PC, you too can be programming an industry-standard GUI API with the world's first internationally standardized Object-Oriented programming language--for free!

  Bindings to "Industry Standard" Libraries

• Ada Network Components. Provides sockets, IP multicast, etc.
   
• TASH is the implementation of a binding to Tcl/Tk from Ada. With it, you can extend Tcl/Tk using Ada instead of C, and use Tcl/Tk library functions, such as string and list handling, regular expression pattern matching, hash tables, and platform-independent graphical user interfaces, in an Ada program.
   
• GtkAda is an Ada95 graphical toolkit based on Gtk+, providing the complete set of Gtk+ widgets using the Object-Oriented features of this language.
   
• AdaBroker is a set of tools and libraries that can be used to develop CORBA applications in Ada. It provides an IDL parser, Ada code generator, the CORBA predefined Ada support packages (defined by the Ada mapping) and a thick Ada binding to the C++ omniORB2 ORB.
   
• Florist is the FSU implementaton of IEEE Standard 1003.5b-1996, the POSIX Ada binding, including real-time extensions. This software provides access to the UNIX operating system services for application programs written in the Ada programming language. It is designed to be self-configuring for a POSIX-compliant system. The complete Florist sources are available via public ftp.
   
• Ada COM tools at www.adapower.com
   
• GNACK - The GNU Ada Corba Kit
   
• Ada Binding to the WWW Common Gateway Interface (CGI)
   
• Ada binding to POSTGRES (a free SQL server)

  Data Structure Component Libraries

• The Reusable Software Component Library of the Swiss Federal Institute of Technology at Lausanne (EPFL).
   
• The Free Ada95 Booch Components
   
• Stephen Leake's Ada Library is an Ada 95 implementation of a subset of the C++ Standard Template Library. This site also has an enhanced Ada mode for EMACS and other goodies.
   
• The Drexel University Ada 95 Generic Vector and Matrix Library
   
• Generic Software Library from Software  Construction and Data Structures with Ada 95, by Michael B. Feldman
   
• Generic and Inheritance-Based Software Components from Data Structures and Algorithms, by John Beidler

  Other Cool Component Sites

• Great Components and Utilities for Ada 95 under DOS and Linux from Jerry van Dijk
   
• Great Components and Utilities for Ada 95 under Windows from Jerry van Dijk
   
• Ada for Linux Team; lots of great components for GNAT under Linux and other platforms.
   
• Ada Source Code Treasury
  
  
• Ada Concurrency Simulator and other great stuff from Motti Ben-Ari