AdaBrowse http://home.tiscalinet.ch/t_wolf/tw/ada95/adabrowse/
Tool to generate extensively hyperlinked HTML or XML documentation from Ada sources (library unit specifications). Uses ASIS. Generated XML can be used to produce documentation in other formats. [Open source, GPL]
Gch http://www.kolumbus.fi/vitali.kaufman/gch/
A tool that checks Ada sources against a given set of rules. It is an ASIS-based tool built on top of the ASIS implementation for GNAT (ASIS-for-GNAT).
Green Hills AdaMULTI http://www.ghs.com/products/AdaMULTI_IDE.html
A complete integrated development environment (IDE) for embedded applications using Ada 95, C, C++, Embedded C++ and FORTRAN. AdaMULTI runs on Windows or UNIX hosts and supports remote debugging to a variety of target environments.
UML Tools for Ada http://www.excelsoftware.com/umlforada.html
WinA&D is a UML modeling tool with Ada code generation. WinTranslator generates UML models from existing Ada code. Together WinA&D and WinTranslator provide complete round-trip engineering of Ada code from UML based design.