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

Day job uses Tenable for strategic vulnerability scanning. So in addition to the other sites commented on I also use tenable.com for additional info. It does tend to lag a bit on zero days though. Source: about 1 year ago

At 45,000 IP addresses, surely you have a support account and should have a customer success manager assigned at Tenable. Give them a ring to find out who that is and ask them for a cadence of check in calls to help you get value out of your company's investment. I'd suggest pitching a professional services engagement such as a health check or quick start to get you going. Calling support and asking for their... Source: almost 2 years ago