Free Ada Source Code
Ada Utility Library
Ada Util is a collection of utility packages for Ada 2005. Several packages are inspired from Java packages and libraries (Java properties, log4j, listeners, streams, ...)
Ada Reusable Code
Ada components, including fuzzy logic, interval arithmetic, string editing, table management, smart pointers, and more.
Matreshka is an Ada framework to develop information systems. It includes: extended support for internationalization; XML processing; web frameworks; SQL database access; and more.
Ada Source for WikiBooks
Can be viewed online or downloaded.
Ada source code from Jacob
Where nothing else is specified these source files are distributed under GNU General Public License with a clarification from the AdaCGI license
Libra is a general library for Ada '95 under Unix-like operating systems. It should work without modification under other operating systems, but GNU/Linux and FreeBSD are the main targets at the moment.