This is only great open source alternative for HelpScout. Using this for events and collaboration between teams for small projects. Indeed its very good option compared to paid services if you want to keep an archive of your data forever and prevent data access by service provider.

When I started looking for an open-source alternative, FreeScout immediately turned out to be a very solid system that was also incredibly easy to install. There are a few benefits to self-hosting FreeScout that might not be immediately obvious. Of course, there are economic advantages… There are also legal advantages: all the data is on your premises. No need to tell users that you’re using a third-party service for support interactions. I think the biggest benefit for us as a company is the liberty to create more users and inboxes when we need them and not be bound by very restrictive account limitations or prohibitive costs. I’ll call this one a win. I hope it inspires companies to do the same.