Lesspain software's developing this tool for screening, logging, organising and transcoding footage called Kyno. Right now is in beta stage BUT, as you can see from below grab, it's a 3 months' worth beta; maybe 6 without updates - See comments below. You can work offline, just provide an email at their homepage, DL the beta and they send the license to you - https://lesspain.software/kyno/

 
If it's the case that you find useful to browse, review, mark, tag, rewrap, comment, etc. your footage either before dropping it to the NLE or just for cataloging purposes, you would most likely enjoy the experience of using Kyno {ice cream ice cream}.

 
Direct OSX download link - https://cdn.lesspain.software/dist/Kyno-beta.zip

 
I barely test drove it, anyhow this is what I liked:

• Folder/drive/card browse without importing
• Extremely responsive and fast (tested with proRES and patched AVCHD material)
• UI's to the point, practical with
• resizable tabs and easy access to main functions
• direct scroll magnification and mouse drag // despite other than "fit" viewer is suppose to go under 100%, that's not working but it is up to 800% (!!)
• Logs' direct FC 7 (!!) and FC X export links and Premiere send function with several sub commands options (also subclips) --- that TC below's not from Kyno!!
  
• Rewrap, convert with plenty vid and/or audio options (no DNxHD though)
• Content thumbs' divider provides an useful visual cue for long takes
• Ratings, metadata input and track info is perfectly simple "enough"
• Subclips show in and out posterframes, again useful visual cue
• Shortcuts to main functions
• Clear zebras (under/over exposed)
• Loop, cue points and variable speed playback
• Widescreen mask ( though fixed 2.35:1 ratio)
• Filter search

There are bugs and inconsistencies (e.g. the below 100% zoom or fullscreen viewer strange behaviour), there's missing important features like LUT preview, TC burn, edit shortcuts menu, etc. But it is a powerful and IMO useful tool to have.

Yes after the beta it'll be paid, but worst case scenario you'll have a free video DAM for 3 months; maybe 6 without updates - see comments below =)

 
gashô