EiffelStudio
- An Eiffel compiler for Unix, Win32, and VMS which supports Java, COM, threads. A product of ESI (Eiffel Software Inc.).
- http://www.eiffel.com/products/studio/

Enterprise SmartEiffel
- ESEwiki. ESE is a SmartEiffel extension, the GNU Eiffel compiler, tools, libraries. Goal: provide business-ready features such as data management and inter-process communication (databases and web services). Articles, libraries, tools, blackboard.
- http://ese.sourceforge.net/wiki/index.php/Main_Page

Visual Eiffel
- A complete development system for Eiffel with Compiler, Workbench, Debugger, Libraries and additional Tools. It's available for WIndows and Linux. [Open source, GPL]
- http://www.visual-eiffel.com/

elj-win32
- Powerful GNU Eiffel win32 (Win-95/98/NT) distribution. Includes C Compiler, IDE, win32 GUI Libs, Eiffel/C Documentation, and EPAN library archive. (FTP)
- ftp://ftp.loria.fr/pub/loria/SmartEiffel/elj-win32/

SmartEiffel
- Official Free Software Foundation GNU Eiffel compiler, tools, libraries. Can generate C code or Java bytecode. Was SmallEiffel, changed 6 September 2002. Now has positive version numbers. Basis of Fine. [Open Source, GPL]
- http://smarteiffel.loria.fr/

SmallEiffel
- Old, original website of what is now SmartEiffel. Of historical interest, with a unique version numbering system using negative decimals. Became official Free Software Foundation GNU Eiffel compiler as of version -0.82.
- http://smalleiffel.loria.fr/

Fine
- Derived from SmallEiffel, now SmartEiffel, with some added and modified features to improve Eiffel language. Description, links, contact website and email. [Open Source, GPL]
- http://fine.sourceforge.net/