These are excellent complements to Powerbullet. 

Clipyard - a excellent inexpensive tool for compositing multiple SWFs into a single file. Works well with Powerbullet. 

Photofiltre- a free image processing program 

Audacity - a free, full-featured audio recording and editing program 

Wink - a great free tool for creating Flash software tutorials 

Swf2Avi - Convert exported Flash presentations to AVI format