!!Some of these are for more advanced users so be careful!!

Useful tools:

BlackBerry Swiss Army Knife

http://bbsak.org/

Shink-A-OS

http://www.theiexplorers.com/

BB Boss

http://forums.crackberry.com/leaked-beta-os-f95/bb-boss-version-2-2-a-590346/

 

Webtext apps/sites:

Cabbagetexter: http://www.cabbagetexter.com