IPNetShareX is a Servers & Network software developed by Sustainable Softworks. After our trial and test, the software is proved to be official, secure and free. Here is the official description for IPNetShareX:

MarydownEditor: IPNetSentryX is an Advanced Firewall intrusion detector that includes bandwidth allocation, bandwidth accounting, Ethernet bridging, Airport configuration, and detailed logging. IPNetSentryX supplements and is fully compatible with Apple's own firewall in OSX while providing additional capability to solve network problems users may encounter.

Unlike most other Internet security products, IPNetSentryX offers basic Protection without erecting barriers for the safe use of your Internet connection. There is no need to "Punch holes" in a firewall for specific applications you may wish to run. Instead, IPNetSentryX silently and intelligently watches for suspicious behavior, and when triggered, invokes a solid filter which completely bans the potential intruder from your Macintosh. The advantage is you don't need a network expert to configure your firewall or debug compatibility conflicts.

Beyond this basic protection, IPNetSentryX offers unprecedented flexibility for specifying what traffic to allow on your network and responding to network events.