Recent blog posts for developers
Smiley
Smiley is an easy way to add, remove, and edit smileys for iChat and iChat AV. It is also a good example of simple authentication procedures for opening and saving system-owned files. Objective-C under GPL license.
FCSABPeoplePicker
The FCSABPeoplePicker (long name, too many acronyms) was made as an alternative to Apple's ABPeoplePicker. Apple's version is more fully featured and integrates very nicely with a lot of power, but isn't backwards compatible. The FCSABPeoplePicker only focuses on very basic information gathering but works on OS X 10.2. The included code focuses on phone numbers, but can be modified to search through just about anything in the Address Book. Objective-C under Creative Commons Attributive license.
Crash Reporter
Apple provides a crash reporter for when apps go down, but the information is sent to Apple, not the developers. Great applications such as Adium have their own crash reporters. Working with information from Adium lead developer Adam Iser, From Concentrate Software has developed a crash reporter that mixes the best of open source with a bit of good from closed source. The code that needs to be integrated into the application is public domain, but the Crash Reporter application is GPL'd. Download the guide (includes all necessary source). Download source files to my crash reporter (from MacDialer).
getDelicious.sh
getDelicious.sh is a simple shell script designed to grab bookmarks from del.icio.us and reformat it to strip out the class tags. Run from the Terminal as "sh getDelicious.sh > filename" where filename is the name of the file you want to write it to. Otherwise it will display in the console. It's then just a quick copy and paste or scripting magic to place it into a webpage.
NSAttributedStrings to HTML category
This category represents additions From Concentrate Software made to NSAttributedStrings to be able to convert them into NSStrings containing HTML for use in RTF2HTML and other applications.
pledit
pledit is a command line tool designed to read and edit Apple property lists. The source is available under the FCS License