Dolibarr ERP & CRM
- Website: https://www.dolibarr.org/
- Description: a modern and easy to use software package to manage your business (customers, invoices, orders, products, stocks, agenda, e-mailings, shipments…).
- Wiki: https://wiki.dolibarr.org/
- Forum: https://www.dolibarr.org/forum
- Repo: https://github.com/Dolibarr/dolibarr
- License: GNU General Public License v3.0
- Add ons (marketplace): https://www.dolistore.com/en/
Potentially Dolibarr could take over a lot of functionality, there is a ticket module and a IMAP email fetcher for it (both GPL V3 but for sale, €171). The stable install is packaged as a .deb. Their forum looks like a blast for the past after getting used to Discourse!