efm is a e17 module, all modules come in 1 package so you can't uninstall it but if you disabled the module it shouldn't bother you anymore.
You can replace what you want depending on the applications you need or are used to. We can give you hints or point you to alternatives if you're looking for something.
Some of my favorite light apps:
-pino for ùblogging
-deadbeef and clementine for audio
-whaawmp for video
-lxterminal and lxtask
-sylpheed mail client
-abiword and gnumeric for office
-easymp3gain & transcoder audio edition
-flphoto for my camera
Of course there's much more in the repo to play with.