Nagios Enterprises has recently migrated a number of its Open Source project repositories to GitHub. Nagios Core, NDOUtils, and NRPE projects have been moved to GitHub from their previous Sourceforge location to allow community members to easily make contributions, submit bug fixes, and suggest feature requests for the Open Source projects. Additionally, the move to GitHub allows community contributions to quickly be incorporated, has advanced issue and bug tracking capabilities, and can better track project history and community involvement.
Nagios Core
https://github.com/NagiosEnterprises/nagioscore
NRPE
https://github.com/NagiosEnterprises/nrpe
NDOUtils
https://github.com/NagiosEnterprises/ndoutils
To view all Nagios GitHub repositories, visit the Nagios GitHub