See LEA Web site

Features:

• Multi-document
• Multiple undo’s & redo’s
• Multi-line & multi-point edit, rectangular selections
• Color themes, easy to switch
• Duplication of lines and selections
• Syntax highlighting
• Parenthesis matching
• Bookmarks
• Includes HAC, the HAC Ada Compiler
• Smart editor features (auto-completion, navigation, mouse-hover infos)
• Includes numerous examples of Ada programs, ready to be run
• Single executable, runs without installation
• Free, Open-Source

Currently available on Windows.

• Gtk or other implementations are possible: the LEA_Common[.*] packages are GUI-independent.
  LEA is programmed in Ada, as well as HAC.