Opensource Software used at your MSP

I wanted to start this discussion to see what other MSP's are using regarding free open source software. I'll start...

PopOS and Linux Mint - Desktop OS
Firefox - Web Browser
LibreOffice - Document Creation
DrawIO - Diagrams
Pixel 4a with LineageOS - For Mobile Phone
Nextcloud - File Syncing and Sharing, Calendar, Contacts, Talk
TacticalRMM - Remote Management and Monitoring for clients
Meshcentral - Remote Desktop Access
HestiaCP - Web/Mail/DNS/DB Hosting - Also used for DynamicDNS
Rainloop Webmail - For Email
Vaultwarden - Internal Password Management
Proxmox - Hypervisor
Proxmox Backup Server - For Backing up Virtual Machines
Proxmox Mail Gateway - For Client Onsite Exchange server filtering
Dokuwiki - Internal Documentation
pfSense - Firewall
Ubiquiti Unifi - For Network Management - Not really opensource but still self hosting
Ubiquiti UISP - For Firewall/End Device Management
FusionPBX - To Manage VOIP Phones
Zabbix - Network and Device Monitoring and alerting
GrayLog - Central Logging
ITFlow - Invoices, Accounting, Ticketing, Client Documentation, Mail Campaigns
There Probably more..

most of yours + veeam/idrive for backups and replications, check central, uptimerobot, virtualmin

I know it's a bit unorthadox, but many of our clients use a mixture of UNRAID and Ubuntu server for docker and file storage.

Unfortunately these are usually the same clients that just refuse to spend money where it's often needed.

Using UptimeKuma instead of Uptime robot for some monitoring
LibreNMS - Integrated into slack / teams for alerting and monitoring