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Mailspring - Mailspring is a mail client for Mac, Windows and Linux.
Nullboard - Minimalist locally-stored kanban board / task list manager.
Geary - Geary is an email application built for GNOME 3.
Huboard - HuBoard is built from the ground up using the GitHub public API.
Airmail - Airmail is a lightweight and lightning fast mail client for Mac.
Brisqi - Offline-first personal Kanban app