Pacifist is compatible with Mac OS X 10.8 or higher, including Mac OS X 10.10 “Yosemite”. Pacifist requires a 64-bit Intel™ processor.

One of the fun things about the Mac going all the way back to the original was the way it stored user interface data for applications inside a separate stream called the “resource fork”, in a format readable by a tool named ResEdit. This allowed users to poke around inside applications and learn how their UIs ticked, and it was also helpful to developers, who could look at Apple's interfaces for examples when trying to figure out how to do something UI-related. In Mac OS X, this tradition continued, with ResEdit replaced by a tool named Interface Builder, and the resource fork replaced by a file called the “nib file” (with NIB standing for NeXTSTeP Interface Builder). Nib files contained even more information than the classic resource forks, and were of great interest to tinkerers and developers.

CocoaTADS
CocoaTADS is a port of the HTML TADS interpreter to Mac OS X. HTML TADS is a multimedia interactive-fiction platform, allowing you to play text adventure games (many of which can be found here), sort of like the Infocom games from the 1980s, except that HTML TADS allows not only text but also graphics, sound, and even animation. You can find more information about HTML TADS here. CocoaTADS is currently extremely pre-beta, and there are no guarantees on how well it will work on your machine.

OS9Experience
OS9Experience is a stupid little app that recreates certain behaviors that users of the classic Mac OS (meaning versions prior to 10.0) should be familiar with. If you feel a little nostalgic for the old days, this app may be just the thing for you! This app can be a fun addition to an unsuspecting co-worker’s Login Items. Now updated to work properly on multi-monitor setups, and available as a Universal Binary.

Requirements
Intel, 64-bit processor
OS X 10.8 or later

Home Page - http://www.charlessoft.com