I think FreeScout is going to be something to consider. Source: about 1 year ago

FreeScout is an open-source, self-hosted version of HelpScout that offers complete privacy and control through a PHP/MySQL application that's easy to deploy. This powerful-yet-lightweight help desk and shared inbox can serve as a nice free alternative to Zendesk/HelpScout for providing efficient customer support. Troubleshootmertr recommends it "for ticketing.". Source: about 1 year ago

I know this gets some hate for not being "pure" open source, but I'm a massive fan of FreeScout (https://freescout.net/). The core is open source, with add-ons you can purchase (one-time purchase per domain). Source: over 1 year ago

For a good open source/self hosted software project, please see https://freescout.net/. Source: over 1 year ago

I have some traction using https://freescout.net/ after Missive was getting too expensive, and it works very well.... Source: over 1 year ago

> Hook up a shared mailbox, collaborative inbox, or one of the many off-the-shelf customer service solutions like Zendesk, Zoho Desk, Freshdesk, Zammad, osTicket, or FreeScout to your email. This list is missing the classic, and still excellent, Request Tracker. https://bestpractical.com/request-tracker https://github.com/bestpractical/rt (I have no affiliation,... - Source: Hacker News / about 1 month ago

At a previous company we used RT (open source), self hosted: https://bestpractical.com/request-tracker We hooked it into help@company.com emails and also made a web page that allowed customers to ask for support when they were logged in. The web page would add customer details when signed in so the CS staff didn't have to look as much stuff up to answer the question. They have cloud-hosted plans though I have no... - Source: Hacker News / 9 months ago

Request Tracker is an older ticket system that also does asset management and can associate tickets with assets. It can be rather tedious to configure, as I recall, but it can do almost whatever you want. Hope you know some perl. Have not used it in at least 5 years. https://bestpractical.com/request-tracker. - Source: Hacker News / 11 months ago

I have had good luck with RT Https://bestpractical.com/request-tracker It was a good mix of customizable and supported. Source: 12 months ago

We used this several versions back. We just outgrew it. https://bestpractical.com/request-tracker. Source: about 1 year ago