HwKeeper
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If you've ever dreamed of playing Heroes 3 in a browser, now it's a reality.
For about a year now, one of the fans of Heroes 3 has been developing a non-commercial, open-source game on JavaScript and PHP.
The project is actively looking for people who want to join and help with further development.
If you would like to join, you can find all the details in the following thread on the forum.