Note-Taking

Apps

Bear is a beautifully-crafted note-taking and writing app for iPhone, iPad, and Mac. It can be a handy place to keep notes about your OmniFocus actions and projects and other reference information.
Craft is a meticulously-designed note-taking app for iPhone, iPad, Mac, Windows, and the web. It's well integrated with OmniFocus and is a great place for reference information and project support notes, whether you're using it individually or as part of a team.
DEVONthink is a powerful data storage and research app for Mac, iPhone, and iPad that's a natural complement to OmniFocus. Through the use of links, you can have a vast amount of data at your fingertips as you work on tasks in OmniFocus.
Evernote is a natural complement to OmniFocus. Use it to store ideas for upcoming projects and as a repository for project reference material.
A highly-flexible, cloud-based app that individuals and teams can use to write, plan, collaborate, and get organized.
OmniOutliner is a natural complement to OmniFocus. Among other things, it can be used to plan projects and as a repository for project support material.