jedit has a nice fortran mode and you can define keybindings for the compiler and debugger.
for small to medium sized projects it is quite nice. it also has svn and multiple files search. also very nice is hypersearch where you get a list of you matches and you can go to the position with a single click. another goodie is a plugin for gdb and for ctags. you can very easily script all functions using jython. it feels a little bit like a modern version of emacs that uses python instead of lisp. check out the plugin manager. it lets you download all the plugins from the server and installs them for you (like in eclipse).
http://www.jedit.org
