EagleFiler’s file management is complemented by Bean’s file editing capabilities.
Bean is a free rich text editor that adds some word processing capabilities, like TextEdit on steroids. The added capabilities are nice, but my favorites are Bean’s full-screen mode (default white text on blue screen, but user editable) and the font size slider for quick adjustment of on-screen rendering of text.
Set Bean as the default editor for .rtf, .rtfd, and .txt files and you can access WriteRoom-like capabilities from EagleFiler for free.