Similar to Bluefish

Enlightened Sound Daemon

Erlang (programming language)

ERP5

Mule (software)

Exa (command-line utility)

Expr

EZ Publish

F-Spot

Falkon

Far Manager

Fetchmail

FindBugs

Firebird (database server)

Firestarter (firewall)

Firewalld

Flask (web framework)

FLTK

FMSX

FOLIO (library services platform)

Foresight Linux

FreeCAD