Mainly because of their reasonable prices (all less than $40), unique and functional, continually updated software, and decent trial conditions:
VoodooPad
DevonThink
OmniOutliner
NetNewsWire
The Bat!
NewzCrawler
Tag&Rename
Mainly because of their reasonable prices (all less than $40), unique and functional, continually updated software, and decent trial conditions:
VoodooPad
DevonThink
OmniOutliner
NetNewsWire
The Bat!
NewzCrawler
Tag&Rename