EtherCalc

ProductivityotherFreeWebSelf-Hosted

Web-based collaborative spreadsheet allowing multiple users to edit simultaneously in real time

GitHub stars

Google Sheets

Productivity

Web-based collaborative spreadsheet with Excel-compatible features and real-time editing support

Self-hosted bookmark and read-later manager with AI-powered automatic tagging

Open-source calendar application with scheduling, event management, and cross-platform integration

Collaborative markdown editor for creating notes, presentations, and documentation in real time

Next-generation knowledge base combining docs, whiteboards, and databases in one workspace

Online office suite with document, spreadsheet, and presentation editors supporting real-time collaboration