Plain text app wizard Jesse Grosjean is out with a new outlining app for the Mac, named Bike:
Outlines are powerful, but can be confusing. In Bike outline editing is fluid, your ideas flow across the screen instead of jumping from position to position. This makes it easier to track what’s going on, and it’s fun!
I really like how Bike works; too many apps in this category are just too heavy. If you do a lot of outlining, it’s an easy $29.99.