BLAS
An Ada 95 binding to the BLAS Fortran library, which contains routines for doing fundamental vector and matrix operations.

Guile
Ada 95 bindings for the GUILE embeddable scheme interpreter.

pyAda
An Ada 95 binding to the Python interpreter.

The Big Number Page
Several high-precision mathematical packages.

Sal
Stephe's Ada Library Ada contains several useful data structures like stacks.

Tash
An Ada binding to Tcl/Tk.

Florist
A POSIX Ada binding, including real-time extensions (this is the original page, download it where you download GNAT).

Ngeadal
An Ada library for Unicode.

MPI
An Ada 95 binding to the Message Passing Interface (MPI).

Lego Mindstorms
Ada interface to Lego Mindstorms.

Tat
A thick Ada binding to the Tk windowing library.

Ada95 Software and Bindings
Listing of several free bindings with descriptions.

Serpent
The Serpent encryption algorithm written in optimized Ada.

Gautier's 3D Engine
Real-Time 3D engine and game library, fully in Ada 95.

Ada Components
The page contains notes on work done on components for Ada.

QtAda95
Qt in Ada.

Unzip Ada
A decompression library for .ZIP files without any compiler or operating system dependency.

Templates Parser
(GZ) Useful for web programming with the Ada Web Server, for example.

AdaSockets
BSD sockets binding for the Ada programming language. [Open source, modified GPL]

Ncurses Binding
An Ada 95 binding to the Ncurses console library.

Persistent Objects
Documentation and Code.

Ada Network Components
Freely available components: AdaSockets, Eratho (alpha), PostgreSQL database binding (BSD license).

XInAda
The Ada implementation of X11/Xt/Xm.

AdaTCL
Quite dated Ada-TCL bindings. Normally, you'll want to use TASH instead.

AdaGMP
A binding to the GMP big math package.

ncurses
GNU ncurses includes an Ada 95 binding.

GtkAda
An Ada95 graphical toolkit based on Gtk+, providing the complete set of Gtk+ widgets.

ASL
The Ada Structed Library is a collection of container and semaphore types.

ABWG
The Ada Bindings Working Group.

The Ada95 Booch Components
The (free) Ada95 Booch Components.

Astrophysical software components
Also Swing's Ada95 class library and an Ada95 interface to PGPLOT by Martin J. Stift.

PragmARCs
PragmAda Reusable Components are an open-source library of data structures and utility functions.

Ada and Java Lexer
by Christoph Karl Walter Grein with Ada sources.

Glut
A window system independent toolkit for writing OpenGL programs.

Templates Parser
Documentation.

AdaOpenGL
An Ada binding to OpenGL. [Open source, BSD License]

AdaCL, Ada Class Library
Textfile search and replace (as Library and demo programs) Trace support. Protected and Task Queues. [Open source, GPL]

Adalog Components
Ada packeges including Debug, OS Services, Protection (a kind of evolved semaphore), Variable String. Also tools and adapplets (Java applets writing in Ada)

AdaERL
Interface letting call Erlang from Ada.

Libra
A general library for Ada '95 under Unix-like operating systems. It currently provides some basic data structures. Also it provide abstractions for NNTP and SMTP commands.

OpenToken
A series of Ada packages that allow simple creation of token analyzers (aka: lexical analyzers) in straight inline Ada code.

XML4Ada95
The Ada 95 binding to Xerces, which enables the use of the W3C DOM in Ada.

The Ada Library Projects
Overview of Ada Library Projects at AdaWorld.

Ada Semantic Interface Specification for GNAT
Providing an up to date implementations of ASIS = Ada Semantic Interface Specification for GNAT. ASIS is a published international ISO standard (ISO/IEC 15291:1999).

Adalog Debug
A package provides a sophisticated trace facility, especially valuable for multi-tasking programs. The child package Debug.Timing also provides utilities for measuring execution time, and the child package Debug.Assert provides utilities for checking that certain properties of program are actually met.

GLADE for GNAT
Providing an up to date implementations of Annex E (Distributed Systems) of the ISO standard ISO/IEC 8652:1995/COR1:2000 for GNAT. [Nothing to interface builder of the same name (GLADE)]

AdaSDL
A set of Ada (programming language) bindings, ports, and some original applications based on SDL (Simple DirectMedia Library). [Open source, LGPL]

Open Image
A portable Ada 95 package hierarchy devoted to the Input/Output and manipulation of image (pictures) data. [GPL with same special exception as the GNAT run-time]