Symfony

Symfony is a high-performance PHP framework for building web applications, known for its flexibility, reusability, and large community support.

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.

Sync-in is an open-source file storage, sharing, and collaboration platform that prioritizes data sovereignty, security, and user control.

Syncthing

Syncthing is an open-source, decentralized file synchronization program that securely syncs files between multiple devices in real time without a central server.

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.

Tableaunoir is an online collaborative blackboard with interactive fridge magnets for teaching, presentations, and animation creation.

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.

Tailscale

Tailscale provides a simple, secure, and scalable networking solution for connecting users, devices, and services.

Tanaguru

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

Tantivy is a full-text search engine library inspired by Apache Lucene and written in Rust

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.

Teable

Teable is a super-fast, real-time, no-code database built on PostgreSQL, offering a spreadsheet-like interface for collaborative data management.

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

Teleport

Teleport is the easiest and most secure way to access and protect all your infrastructure.

TemaTres

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

Terraform is an Open Source infrastructure as code software tool for automating the provisioning and management of any cloud, platform, or infrastructure.

TerraVisu is a webGIS solution that visualizes and analyzes territorial data for improved decision-making.

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.

Threefold Tech

TF9 is a revolutionary, autonomous cloud computing platform offering unparalleled security, scalability, and efficiency for planetary-scale deployments.

Threema Broadcast

Threema Broadcast is a secure web application for efficient one-to-many communication via instant messaging, offering features like messenger newsletters, chatbots, and centrally managed groups.