Welcome to the EFM website!
EFM aims to be a better alternative to RTF for writing and editing fiction. It is a plain text based format, which means there are many, many tools that can edit it - even Notepad will handle it, if you make sure to pick "UTF-8" when you save it.
Currently, the only tool for EFM is one to convert it to RTF. Hopefully, this will be useful for anyone who wants to write fiction in a program that doesn't save RTF (or on something like an Alphasmart). You can read all about EFM's already-existing features here.
If you want to use EFM, here's how to get it and run it.
Once the converter-to-RTF has most of the planned features and is polished up a bit, then I will work on a tool or tools for tracking changes when editing.