We don't know any good myHQ open-source alternatives yet.
You are more than welcome to suggest any alternatives that you know of, or ask the community for suggestions.
Alternatively, we recommend checking out LibHunt for open-source libraries and alternatives to myHQ.
myHQ is an excellent platform that allows you to rent amazing coworking spaces at very affordable prices. The membership plans are flexible and you have multiple options to choose from according to your business or professional needs.