Similar to Little Snitch in functionality.
GlowWorm FW Lite is a rule-based network security and monitoring application based on plugin-accessible framework. By defining rules based on a set of connection criteria including the addresses, ports, the relevant endpoint and protocol, as well as a specific application, one can effectively restrict network activity. A free registration code is necessary to use this program.
The developer is also working on a non-Lite shareware full version.