ActiveState has released Komodo Edit 4 for free. While basic, it offers a few interesting features including code AutoCompletion. Make sure to give it a try here.
Once installed, you may find yourself puzzled by the lack of an F5 or one-click Run option. I’ve put together a small screencast that shows how to associate the F5 key with the execution of the current open ruby file (click the image below to open the video).
I know it’s not Komodo IDE (the commercial bigger brother of the Edit version), but I would have expected the program to recall the appropriate interpreter based on the file extension just like SciTE does. Feel free to comment and let me know if you find better ways to handle these tasks in Komodo Edit.