Best European alternatives to SOGo in 2026

Fruux

Scheduling

EU Based

Fruux is a unified contacts and calendar sync service that keeps your data in sync across all your devices and apps. It uses open standards like CardDAV and CalDAV to ensure compatibility with a wide range of clients.

Rainloop

Email Marketing

EU Based

RainLoop is a lightweight, self-hosted webmail client built on PHP. It requires no database, supports IMAP, and offers a clean modern interface accessible from any browser. Ideal for personal or small-team email server deployments.

Kolab

Project Management

EU Mentions

Kolab is a fully open-source groupware and collaboration suite that can be self-hosted. It offers email, calendar, contacts, and file sharing with support for CalDAV, CardDAV, IMAP, and WebDAV standards.