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TolariaNotes & Knowledge ManagementTolaria is an AGPL-licensed desktop app for macOS, Windows and Linux that manages a folder of Markdown files with YAML frontmatter as a vault, adding types, relationships, saved views, a built-in Git client, spreadsheet notes and AI agent integration.Open sourceSoftware
Tonkatsu BoxMedia Players & StreamingTonkatsu Box is a free, MIT-licensed Flutter app that tracks games, movies, series, anime, manga, visual novels, books and audio in a local SQLite library. It runs on Windows, Linux, macOS and Android, or self-hosted in a browser.Open sourceSelf-hosted
ToolJetLow-Code & Internal ToolsToolJet is an open-source, AGPL-3.0 platform for building internal tools, admin panels and dashboards on your existing databases, APIs and SaaS systems.Open sourceSelf-hosted
ToolpadWeb Frameworks & UI LibrariesToolpad is MUI's MIT-licensed set of React components for dashboards and internal tools; the repository says it is no longer actively maintained.Open sourceSelf-hosted
TracexyMonitoring & ObservabilityTracexy is a native SwiftUI packet analyzer for macOS 14+ from Rockxy LLC. It captures live traffic or opens PCAP/PCAPNG files and organizes frames into sessions with process attribution, decoded fields and raw hex. AGPL-3.0 source, optional paid Pro license.Open sourceSoftwareFreemium
Trail of BitsPentesting & Bug BountyTrail of Bits is a security firm doing audits and research in cryptography, blockchain, AI/ML and application security, with 200+ open-source repos.CommercialSoftwareContact sales
Travis CICI/CDTravis CI runs build and test jobs from a configuration file in your repository, as a hosted service or on-premise with Travis CI Enterprise.CommercialSelf-hostedPaid
TryPostMarketing & SEOOpen-source social media scheduler with a composer, calendar, per-channel queues, member approvals, analytics and video repurposing. AI agents work through an 83-tool MCP server or the REST API. Self-host with Docker under AGPL-3.0 or use TryPost Cloud.Open sourceSelf-hostedFreemium
TSP (tick-stock-panel)Trading & Market AnalyticsTSP is an MIT-licensed, self-hosted workbench for Chinese A-share strategies, factor research, backtesting and monitoring, with core features exposed as an API.Open sourceSelf-hosted
Tuta MailEmail Clients & ArchivingTuta Mail (formerly Tutanota) is an encrypted email, calendar and contacts service from Tutao GmbH in Hanover. Its web, desktop and mobile clients are GPLv3 on GitHub; the server is closed and there is no IMAP.Open sourceWeb platformFreemium
TutorLoomTutorials & CoursesTutorLoom is an Apache-2.0, self-hosted, multi-tenant learning management system by Pace Wisdom Solutions, built with Django and React. It covers course building, batches, grading, progress, certificates and a REST API.Open sourceSelf-hostedFreemium
Twake ChatTeam Chat & MeetingsTwake Chat is an AGPL-licensed Flutter client for the Matrix protocol, built by Linagora. It offers group chats, spaces, voice messages, end-to-end encryption and compatibility with other Matrix clients on Android, iOS and the web.Open sourceWeb platform
Twake MailEmail Clients & ArchivingAGPL-3.0 email client from LINAGORA built with Flutter. It reads mail over JMAP instead of IMAP, ships Android and iOS apps and a Docker web image, and adds team mailboxes, rules, OIDC login and Twake Workplace integration.Open sourceSelf-hostedFreemium
uBlock OriginBrowsers & ExtensionsuBlock Origin is a free, open-source content blocker for Firefox and Chromium browsers with filter lists, custom filters and per-site controls.Open sourceWeb platform
UmamiAnalytics & BIUmami is an MIT-licensed web and product analytics platform: a small cookieless tracker feeds traffic, events, funnels, retention, revenue, session replay and heatmap reports. Self-host it with Node.js and PostgreSQL or use Umami Cloud.Open sourceSelf-hostedFreemium
UnInboxEmail Clients & ArchivingUnInbox is an open-source email platform for teams: shared and personal spaces, per-conversation workflow statuses and extra addresses, as a hosted service with free, Pro and Enterprise plans. Self-hosting guidance is limited.Open sourceWeb platformFreemium
UnTangledNetwork ManagementUnTangled is a GPL-2.0-or-later web interface for OpenWRT 23.05 and newer. It adds a Network Map, device controls, mesh Wi-Fi, parental schedules, VPN, QoS and firewall screens at /untangled/, while LuCI stays available at the root path.Open sourceSelf-hosted
Uptime KumaUptime Monitoring & Status PagesUptime Kuma is a self-hosted monitoring tool that checks HTTP, TCP, ping, DNS and Docker targets at 20-second intervals and publishes status pages.Open sourceSelf-hosted
UptraceMonitoring & ObservabilityUptrace is an AGPL-3.0 observability platform that ingests OpenTelemetry traces, metrics and logs into ClickHouse, with dashboards, SQL and PromQL-like queries, alerting, incidents and SLOs. Self-hosted editions and a usage-billed cloud.Open sourceSelf-hostedFreemium
useSendAPIs & IntegrationsuseSend is an AGPL-3.0 email platform that sends through Amazon SES. It offers a REST API, SMTP relay, TypeScript, Python and Go SDKs, campaigns, contact books, webhooks and analytics, as a hosted service or a self-hosted Docker install.Open sourceSelf-hostedFreemium
VaultwardenPassword ManagersVaultwarden is an unofficial Rust implementation of the Bitwarden Client API for self-hosting, with personal vaults, organization sharing and multifactor login.Open sourceSelf-hosted
VectorLog ManagementVector is an open-source observability data pipeline from Datadog, written in Rust. It collects, transforms with VRL and routes logs and metrics (traces in alpha) to many sinks, running as an agent or aggregator. MPL-2.0.Open sourceSelf-hosted
VendureERP & Business SuitesVendure is an open-source headless commerce platform built with TypeScript, NestJS and GraphQL, with Shop and Admin APIs, a plugin system, channels and a React Dashboard. The framework is GPLv3; paid plans add B2B features, a commercial license and Vendure Cloud.Open sourceSelf-hostedFreemium