Evernote
Evernote is a natural complement to OmniFocus. Use it to store ideas for upcoming projects and as a repository for project reference material.
OmniFocus Complement
FastScripts
OmniFocus for Mac (Pro) can be automated through the use of AppleScript. FastScripts makes accessing these scripts quick and convenient.
Hazel
Using Hazel for Mac and a little AppleScript, actions can be automatically created in OmniFocus for Mac (Pro) as files are added to specific folders.
Keyboard Maestro
Use Keyboard Maestro to quickly access OmniFocus features and perspectives and bring speed and convenience to frequently-performed activities.
MindNode
Allows you to create visual outlines of your ideas and responsibilities. Useful when designing your system and for planning projects.
SaneBox
A web-based service that helps you tame your email and that reduces the need to create and manage Waiting items in OmniFocus.
TextExpander
Create OmniFocus actions, action groups, and projects more quickly and accurately by defining TextExpander snippets for frequently typed words and phrases.