GNU ncurses includes an Ada 95 binding.

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

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

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

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

The (free) Ada95 Booch Components.

A native Ada implementation of the XPath 1.0 specification for XML DOM document querying. (Requires XMLAda from libre.adacore.com)

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

An Ada 95 binding to the Ncurses console library.

Ada packeges including Debug, OS_Services, Protection (a kind of evolved semaphore), Variable_String. Also tools and adapplets (Java applets writing in Ada)