Sympa

Sympa is Open Source mailing list management software that simplifies communication and collaboration.

Synapse Admin is a maintained fork of the admin console for Matrix Synapse homeservers, offering enhanced features and usability.

Syslog-ng

syslog-ng Open Source Edition is a highly flexible and extensible log management system for collecting, processing, and routing logs from diverse sources.

Taiga

Taiga is a free and Open Source project management tool for agile teams offering Kanban and Scrum support, intuitive interface, and robust customization options.

Tanaguru

Tanaguru provides comprehensive web accessibility solutions, from training and consulting to Open Source tools and website development.

Tarantool

Tarantool is a high-performance, in-memory database that combines the speed of an application server with the reliability of a persistent database.

TDP is a free, Open Source, and community-driven big data platform offering robust performance, flexible deployment, and strong security.

Teampass is a secure, self-hosted, and collaborative password manager for teams and organizations.

TemaTres

TemaTres is an Open Source platform for managing, publishing, sharing, and reusing formal representations of knowledge.

TestLink is an Open Source test management system that helps teams organize, manage, and track software testing efforts efficiently.

BIRD is a highly versatile and Open Source dynamic IP routing daemon supporting a wide range of protocols and operating systems.

The Eclipse Theia IDE is a modern, Open Source IDE for cloud and desktop development, featuring extensive extension support and AI capabilities.

Tianji

Tianji is a lightweight, Open Source, all-in-one insight hub for website analytics, uptime monitoring, and server status, prioritizing user privacy and community collaboration.

Tiki

Tiki is a long-standing, Open Source, no-code/low-code web application for group collaboration, communication, and data management.

Tirreno

Tirreno is an Open Source user analytics platform prioritizing data security and sovereign cybersecurity.

TLDraw is an Open Source, React-based SDK for building collaborative, infinite canvas applications like digital whiteboards.

ToolJet

ToolJet is an Open Source low-code platform for building and maintaining internal business applications quickly and efficiently.

Traccar

Traccar is a free and Open Source modern GPS tracking system offering real-time location tracking, customizable alerts, and comprehensive reporting.

Tracim is an Open Source, all-in-one collaborative platform designed to streamline team communication, project management, and knowledge sharing.

Traefik

Traefik is a modern, cloud-native application proxy and API gateway simplifying the management of microservices and APIs.

Trivy is an open-source, all-in-one security scanner that detects vulnerabilities and misconfigurations in code, containers, and cloud infrastructure.

TrueNAS

TrueNAS is a family of scalable, reliable, and secure Open Source storage solutions for businesses and individuals of all sizes.

Turtl server is an Open Source, scalable Node.js application managing user accounts, data, and access control for Turtl clients.

Typesense

Open Source alternative to Algolia + Pinecone and an Easier-to-Use alternative to ElasticSearch