xenforo that spacebattles is based on seems pretty good, but it appears to be a package deal with hosting (which I suppose funds its development). https://xenf

xenforo that spacebattles is based on seems pretty good, but it appears to be a package deal with hosting (which I suppose funds its development). https://xenforo.com/purchase/ https://xenforo.com/purchase/ edit: found a license only page: https://xenforo.com/purchase/#licenses https://xenforo.com/purchase/#licenses but it seems you only get 1 year of updates for the $160, and then you have to pay the fee again, so even if its lifetime use you will probably want to continue to pay for security or whatever else updates.