Similar to Greasemonkey

Euler Math Toolbox
Euler Mathematical Toolbox
Exa (ソフトウェア)
Exa (command-line utility)
Fetchmail
FetchmailFIGlet
FIGlet
FindBugs
FindBugs
Firefox for Mobile
Firefox for Android
Firestarter
Firestarter (firewall)
FlashDevelop

Framework-spider

FreeCAD
FreeCAD
FreeRDP

FreeS/WAN
FreeS/WAN
Gallium3D
Gallium3DGDAL
GDAL
Geany
Geany
GeoServer
GeoServer
Gephi
Gephi
GlassFish
GlassFish
GNU Taler
GNU Taler
Google Wave
Google Wave
GRASS GIS
GRASS GIS
Hack (プログラミング言語)
Hack (programming language)
HSQLDB
HSQLDB
HTML Tidy
HTML Tidy
HTTrack
HTTrack
Hypertable
Hypertable
IIIMF
Internet/Intranet Input Method Framework
IKVM.NET
IKVM