WildDuck

Category: Communication & Business.

EUPL-1.2-or-later🖥️ Self-hostable

Maddy

Category: Communication & Business.

GPL-3.0-or-later🖥️ Self-hostable

Stalwart Mail Server

Category: Communication & Business.

AGPL-3.0🖥️ Self-hostable

Postal

Category: Communication & Business.

MIT🖥️ Self-hostable

Mail-in-a-Box

Category: Communication & Business.

CC0-1.0🖥️ Self-hostable

Odoo

Category: Communication & Business.

LGPL-3.0🖥️ Self-hostable

SimpleX

Category: Communication & Business, Decentralized Tools, Privacy Tools.

AGPL-3.0🖥️ Self-hostable

Delta Chat

Category: Communication & Business, Decentralized Tools.

GPL-3.0☁️ Hosted only

Telegram Desktop

Category: Communication & Business.

GPL-3.0☁️ Hosted only

Stirling PDF

Category: Communication & Business.

MIT🖥️ Self-hostable