DropScript is one of my favorite.
It's an application for Mac OS X which lets you create new applications from any BSD program which takes files as command line arguments.
Typically, these are scripts written in sh, perl, etc.
DropScript it's free!
Flex is a highly productive, open source framework for building
Manage the versions of source-code files.
Provide children an environment where they can do self-directed learning.
