Sente 6.6.0 is on the verge of release:
Sync2 -- a major update to the sync technology that Sente uses; creating and using synced libraries is now easier than ever.
Find-in-PDF -- now supported on both the Mac and iPad.
New, streamlined PDF annotation interface on the iPad.
Support for the retina display on Mac.
A new approach to licensing makes Sente free for many uses.
Now we can find in pdf, also sente is free for most users with reference upto 100.