Wikipedia
GNAVI is an open source visual software development environment that is composed of three major portions: GWindows GUI framework, GNATCOM ActiveX/COM framework, and GWenerator code generator. The inspiration for GNAVI is Delphi and Visual Basic, where the Pascal-family Ada programming language is utilized as a syntactically-similar substitute for Delphi's Object Pascal. GNAVI is licensed under version 2 of the GNU General Public License ( GPLv2). One of the goals of the GNAVI community to promote the use of Ada among wider programming audiences by demonstrating that ISO standard Ada (i.e., ISO/IEC 8652) has many of the ease-of-programming qualities that have been attributed to proprietary Object Pascal. GNAVI for Microsoft Windows offers features comparable to Delphi and Visual Basic including the use of Active X controls and the ability to interface with Microsoft's .NET Framework and Sun's Java. As of 2009, GNAVI was also being ported to Mac OS X, Linux and other Unix-like operating systems.
The GNAVI website had seen no activity or releases for four and a half years, from December 2004 until early 2009, but on 14 March 2009, the community announced that it has resumed development and multiple versions have been released since then.