Amber for Parrot is an object-oriented scripting language for the Parrot virtual machine. It combines the traditional advantages of scripting languages with support for software correctness and large-scale software engineering. Amber for Parrot has syntax and semantics somewhere between those of Eiffel and Ruby.
EiffelStudio is an IDE for the Eiffel language (ECMA-367, ISO/IEC 25436, and ACM Software System Award 2006). It includes: Eiffel compiler, Eiffel editor, Eiffel code browsing tool, Eiffel testing tool, graphical design tool, refactoring tool, debugger, profiler, and Eiffel analysis tools (Metrics, Dependencies, etc.). Eiffel generates C or CLI for .NET or Mono. Eiffel applies O-O principles and Design by Contract for high-quality software. Many Eiffel libraries are included: ADT, network, GUI, database, parsing (including an Eiffel parser), XML, Web, COM, and more.
SmartEiffel is the GNU Eiffel Compiler. It is intended to be a complete, though small and very fast, Eiffel compiler. The current distribution includes an Eiffel to C compiler, documentation tools, a pretty printer, and various other tools including an Eiffel debugger. It also includes a large library of classes distributed under the terms of the MIT/X Consortium License. Eiffel is an advanced object-oriented programming language that emphasizes the design and construction of high-quality and reusable software.