Top Open Source Email & Communication Tools in 2026
A curated collection of the 65 best free and open-source Email & Communication tools in 2026. Compare features, GitHub stars, tech stacks, and self-hosted software.
Zenblog
Headless blogging CMS with Notion-style editor
Stars253Last commit5mo agoLicenseAGPL-3.0
XWiki
Open source enterprise wiki and knowledge base
Stars1,302Last commit10d agoLicenseLGPL-2.1Vvveb CMS
Open source drag-and-drop CMS and eCommerce builder
Stars1,176Last commit1mo agoLicenseAGPL-3.0
Storyden
Self-hosted community forum platform
Stars332Last commit14d agoLicenseMPL-2.0
Showly
Ultimate TV show and movie tracker
Stars1,449Last commit4mo agoLicenseGPL-3.0
Sigle
Web3 writing platform secured on Bitcoin
Stars490Last commit15d agoLicenseMIT
Prisme Analytics
Privacy-first Google Analytics alternative
Stars130Last commit6mo agoLicenseAGPL-3.0ONLYOFFICE Docs
Secure online office suite compatible with MS Office
Stars6,859Last commit1mo agoLicenseAGPL-3.0
Notifuse
Open-source email platform for newsletters
Stars2,078Last commit20d agoLicenseAGPL-3.0
Mautic
Open source marketing automation platform
Stars10,396Last commit11d agoLicenseOpen SourceLibreOffice
Free and private office suite, no forced AI
Stars4,278Last commit10d agoLicenseGPL-3.0
Outline
Modern team knowledge base & wiki
Stars40,349Last commit13d agoLicenseOpen Source
Billion Mail
Open-source self-hosted email server and marketing tool
Stars15,456Last commit2mo agoLicenseAGPL-3.0
Wraps
Self-hosted email platform for Amazon SES
Stars56Last commit11d agoLicenseOpen SourceWR.DO
All-in-one productivity platform with short links and AI tools
Stars2,281Last commit3mo agoLicenseMIT
