Productivity

Mind Mappers

FreePlane FreeMind (HowTo, Intro) TreeSheets (Tutorials) Calligra Flow Diagram

AGILE Boards

Phacility Taiga.io Kanboard (Windows & Linux Only) Wekan RestyaBoard Trello ZenKit

Project Planners

Project Libre GanttProject Calligra Plan

Timers

Mater PomoLectron Productivity Timer Pomotroid Pomobaro Super Productivity Thomas ZenFocus Cattr Stretchly

Notes

Joplin Logseq StandardNotes Zettlr SimpleNote Evernote Obsidian

To Do Lists

Habitica Todour ActivityWatch (Super early in development) Strategr OpenToDoList

Group Chat

Element Matrix Jitsi Jitsi Meet Rocket Chat Let's Chat Zulip Chat MatterMost Wire Gitter Crust Messaging Jami Mumble Discord Slack

Instant Messaging

Signal Telegram Session Tox Chat HexChat

E-Mail

Tutanota Posteo ProtonMail Thunderbird

Social Media

Okuna Diaspora Friendi.ca Mastodon Textile PixelFed

Fonts

BirdFont (BF Tutorials) Font Forge (Tutorials) Font Library

Document Formatting

LibreOffice OpenOffice Etherpad CryptPad PDFsam Scribus (Tutorials) Calligra Words Calligra Stage Calligra Sheets LaTeX (Tutorial) Lyx TexLive

File Conversion

HandBrake fre:ac X Lossless Decoder (Mac Only) Pandoc