SketchUp PRO () [k'ed] (Universal) versions

Free

Free 3D sketching program for the conceptual phases of design.

Commercial, professional grade version of the classic local server environment for OS X: MAMP.

Most advanced automatic pencil sketch generator in the world, but very easy to use and super fast.

Simple, flexible, non-bloated, single-entry bookkeeping and accounting system for the Mac.

Free

Deletes hidden Sketch history files that take a lot of space on your hard drive.