Skim is a PDF reader and note-taker for OS X. Skim is designed to help you read and annotate scientific papers in PDF.
Skim includes many features and has a great user interface.
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fruux syncs your addressbook between different Macs. The next update will introduce iCal, and bookmark syncing. Preference syncing is also in development. When the basic sync features are completed, so-called social features will provide fruux users automatically updated addressbooks and various options to share contacts, bookmarks and calendar events.

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Acqlite is Gnutella file sharing program based on LimeWire, Acquisition and Cabos. It is free software, no spyware, no adware. It provides simple interface, multi languages support, and iTunes + iPod integration.

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Tierprogramm is an AppleScript based freeware droplet User-Interface for Exiftool. It can be used to change Exif-informations inside jpg files.
Tierprogramm is written by Florian Poeck and offered as it is. There is no warranty at all and usage it at your own risk.
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Hattrick Organizer This is a Mac OS X package (.app) of the GPL Hattrick Management tool.
Hattrick Organizer is regularly distributed with platform independent jar files, and a bunch of additional resources. This is a friendlier app package with everything you don’t want to know about inside. Just drag the .app out of the dmg into your applications folder and run it from there – Mac style! (This was originally Carlos A. Morales T.’s idea, now adopted by the team)
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