PHD2 is the enhanced, second generation version of the popular PHD
guiding software from Stark Labs. PHD2 is free and open source.

Development and support forum:

  https://groups.google.com/forum/#!forum/open-phd-guiding

Web site:

  http://openphdguiding.org

Source code repository:

  https://github.com/OpenPHDGuiding

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