NOTE: FontForge has moved to fontforge.github.io, newer binaries and sources are available at github.com/fontforge.
FontForge allows you to edit outline and bitmap fonts. You may create new ones or modify old ones. It is also a format converter and can interconvert between PostScript (ascii & binary Type1, some Type3, some Type0), TrueType, OpenType (Type2), CID, SVG
Looks promising but constantly keeps crashing on Windows 7 32-bit and Windows 8.1 64-bit incl. portable version.