Open Source Office & Productivity Software
K-9 Mail
K-9 Mail is an open source email client focused on making it easy to chew through large volumes of email. K-9 Mail is designed for both novice and power users and offers lots of features for everyone. It provides features like Push IMAP Support, GPG & PGP/MIME support, Per Account Notifications, Unified Inbox, White and Dark Theme, and Signatures.
Zulip
Zulip is an open-source real-time chat with an email threading model. With Zulip, you can catch up on important conversations while ignoring irrelevant ones. Zulip provides modern apps for every major platform, powered by Electron and React Native. The software is 100% open source software, built by a vibrant community of hundreds of developers from all around the world.
Focalboard
Focalboard is an open source, self-hosted alternative to Trello, Notion, and Asana. It helps define, organize, track and manage work across individuals and teams. Focalboard comes in two editions, a stand-alone desktop app for your todos and personal projects called Focalboard Personal Desktop and Focalboard Personal Server, a self-hosted server for your team to collaborate.
ProtonMail
World's largest secure email service providing end-to-end encrypted email accounts. ProtonMail is based in Geneva, Switzerland and protected by Swiss privacy laws. The software is openly developed with fully open source code.
OpenProject
OpenProject is an open-source, web-based project management system for location-independent team collaboration. The software allow you and your team to efficiently plan, collaborate and document the process of building projects. OpenProject is released under the GNU General Public License Version 3 and is available as free community edition and a commercial, hosted, enterprise edition.
Standard Notes
Standard Notes is a safe place for your notes, thoughts, and life's work. With Standard Notes you can create, edit and manage notes with a complete encrypted app that is free and open source.
LibreOffice Impress
LibreOffice Impress is a free and open source presentation and slide show software that allow you to create interactive slide shows for your next presentation.
Taiga.io
Some of the most agile companies in the world use Taiga.io to deliver promised functionality with in time and budget. Taiga is a project management tool for multi-functional agile teams. It provides a rich feature set through intuitive interface that allow you and your team to define deliverables, communicate efficiently, and execute on tasks at hand. No training or complex setup is required to get started with Taiga.
Tutanota
Tutanota is the world's most secure email service, easy to use and private by design. Tutanota brings secure email for everybody.
Remotely
Remotely is an all-in-one remote access software. With Remotely you can instantly connect to remote desktops either unattended or by invite, where invites are started from a single-file, portable executable that's easy for customers to download and use. Remotely also allow you to do remote scripting so that you can save time on quick fixes and ad-hoc scripting with an interactive console that lets you execute commands against multiple remote machines simultaneously, with instant results. Written with rich auto-complete for PowerShell Core, Windows PowerShell, Windows CMD, and Bash increases speed and accuracy of commands.