self-hosted
(23)
Rocket.Chat
Bring together messaging, voice, video, critical apps, and AI to keep teams connected and missions protected.
XenForo
The forum software built by the people who walked out of vBulletin - and why, in an age of algorithmic feeds, businesses still pay for a place to talk.
NodeBB Bet on the Open Web While Its Rivals Got Bought
While AnswerHub was swallowed by a holding company and the alumni-community market consolidated, this Toronto-built open-source forum wired itself straight into the fediverse. NodeBB's wager is that the open web outlasts the walled garden.
NodeBB
The Toronto team behind NodeBB spent a decade rebuilding the humble internet forum for the real-time web. Now they are wiring it into the fediverse.
vBulletin
The World's Leading Community Software - vBulletin has been powering online forums for more than two decades, and it is still shipping.
LimeSurvey
The simple, quick and anonymous online survey tool that's bursting with juicy insights.
Invision Community
For more than twenty years, a small team has quietly built one of the web's most enduring community platforms - the software behind forums you have almost certainly posted in without knowing its name.
Rocket.Chat Wires HubSpot Straight Into the Chat Window
The open-source messaging platform's HubSpot CRM app pipes leads, deals and support tickets into the conversation - so sales and support teams stop tab-hopping between the CRM and the chat where the customer actually is.
Discourse
Discourse is the customizable, scalable community platform powering more than 22,000 communities that create knowledge through conversation.
Chatwoot
AI assistant, omnichannel support desk, knowledge base. Everything you need for seamless customer support, all in one place.
Corsair
Corsair is an open-source integration layer for AI agents. Its TypeScript framework lets developers connect their agents and apps to hundreds of third-party services - Gmail, Slack, Stripe, Notion, GitHub and more - while Corsair handles the messy parts: OAuth, token refresh, webhook verification, rate limiting, permissions and multi-tenant credential isolation. Agents never touch raw API keys; Corsair resolves them internally and can require human approval before destructive actions. Founded in 2024 by Dev Jain and part of Y Combinator's Winter 2025 batch, the project is offered as a free self-hosted library, a hosted hub with a drop-in MCP URL, and a managed cloud SDK.
Netmaker
Netmaker is an open-source virtual networking platform built on WireGuard that automates fast, secure, distributed mesh networks across clouds, data centers, edge sites, and devices. Founded by former IBM cloud engineers Alex Feiszli and Dillon Carns, it lets teams stitch together servers, containers, IoT devices, and remote users into a single flat, encrypted network - a kind of VPC for distributed systems. A YC W22 company, Netmaker pairs a widely adopted open-source project with paid Professional and Enterprise editions aimed at businesses and managed service providers.
Ghost
Ghost is an open-source publishing platform that lets writers, journalists and creators run a website, send email newsletters and sell paid memberships from one place. Built on Node.js and released under the MIT license, it is stewarded by the nonprofit Ghost Foundation and funded entirely by its users through Ghost(Pro) managed hosting - taking 0% of creators' subscription revenue.
Directus
Directus is an open-source data platform that wraps any SQL database with an instant REST and GraphQL API plus a no-code admin app, letting developers and non-technical users manage content and data without building a backend from scratch. Founded on a project Ben Haynes started in 2004 and incorporated as a company in 2020, Directus has surpassed 30 million downloads and is used by organizations including Adobe, Bose, Tripadvisor, AT&T and the U.S. Navy.
Kion
Kion is a Columbia, Maryland software company that builds a self-hosted FinOps+ platform for managing cloud operations across AWS, Azure, Google Cloud, and Oracle Cloud. Founded in 2018 as cloudtamer.io and rebranded as Kion in 2021, the company combines cloud financial management, policy-based governance, and continuous compliance into a single platform that runs inside a customer's own cloud environment. Its software is used by commercial, higher-education, and government organizations - including NASA, the CDC, Verizon, and Indeed - to control cloud spend, enforce guardrails, and automate account provisioning through retirement.
Coder
Coder is an Austin-based software company that moves software development off individual laptops and into secure, self-hosted cloud development environments (CDEs). Its open-source and enterprise platform uses infrastructure-as-code (Terraform) to provision standardized, governed developer workspaces that run on Kubernetes or VMs across any cloud, on-prem, or air-gapped setup. Increasingly, Coder positions itself as the control plane for enterprise AI development, where human developers and AI coding agents work inside the same governed environment. It raised a $90M Series C led by KKR in April 2026.
Atolio
Atolio is a private, AI-powered enterprise search platform that runs inside a company's own cloud (AWS, Azure, or GCP) or on-premises. It connects to workplace systems like Slack, Google Workspace, Office 365, Salesforce, and ServiceNow, then indexes them with document-level permissions so employees only see what they are already authorized to view. Founded in 2019 by Splunk and PagerDuty veterans, Atolio pairs hybrid semantic-plus-keyword search with permission-aware retrieval-augmented generation, giving enterprises secure question answering across siloed knowledge without their data ever leaving their environment.
Greptile
Greptile is an AI code review company that builds agents which read a pull request against the full context of a codebase - not just the diff. It indexes a repository into a graph of files, functions and dependencies, then runs parallel agents to catch bugs, anti-patterns and security risks, leaving inline comments and PR summaries. Founded in 2023 by three Georgia Tech alumni and backed by Y Combinator, Initialized Capital and Benchmark, Greptile has reviewed over a billion lines of code for teams including Brex, Substack and Retool.
Kloudfuse
Kloudfuse is a Cupertino-based observability company that unifies metrics, logs, traces, real user monitoring, continuous profiling, and LLM monitoring into a single observability data lake that runs inside a customer's own cloud (VPC) rather than a vendor SaaS. Founded in 2022 by veterans of Springpath, Nicira, VMware, and Cisco, it pitches an OpenTelemetry-native, AI/ML-powered platform that gives enterprises data ownership and 60-80% cost savings versus incumbents like Datadog. It launched out of stealth in November 2023 with $23M in funding and is used by companies including GE HealthCare, Zscaler, Tata 1mg, and Automation Anywhere.
Mattermost
Mattermost is an open-source, self-hostable collaboration platform built for organizations that cannot put their conversations in someone else's cloud. Started as a game studio's internal chat tool and open-sourced in 2015, it grew into the leading self-hosted alternative to Slack and Microsoft Teams, combining channel messaging, voice and screen sharing, incident-response Playbooks, and integrated AI agents. Its customers skew toward defense, government, financial services, and technology organizations - from the U.S. Air Force to Uber - that need data sovereignty, air-gapped deployment, and government-grade security.
ZITADEL
ZITADEL is an open-source identity and access management platform that gives developers enterprise-grade authentication and authorization without vendor lock-in. Built in Go with an API-first design and native multi-tenancy, it supports OAuth2, OpenID Connect, SAML, SCIM, passkeys, MFA and self-service flows, and can run as a self-hosted deployment or as a managed cloud service. Founded in Switzerland in 2019 and now remote-first, ZITADEL aims to make identity a foundational piece of infrastructure - like a database or a web server - rather than a barrier to shipping software.
Orama
Orama is an open-source search company building an 'answer engine' for developers - a lightweight, high-performance stack that bundles full-text, vector, and hybrid search with automatic embedding generation and built-in LLMs. Started as the open-source project Lyra and incorporated as OramaSearch Inc. in 2023 by Issac Roth and Michele Riva, its core library ships in under 2KB and runs in the browser, on servers, or at the edge. Orama powers site search and AI answers for developer platforms including nodejs.org, tanstack.com, and solidjs.org, and its OramaCore runtime packages a search engine, vector database, and LLM interface into one deployable unit.
Polytomic
Polytomic is a San Francisco data-movement company that unifies ETL, Reverse ETL, and CDC streaming in a single platform, letting teams keep data warehouses, databases, and SaaS tools in sync without maintaining brittle one-off pipelines. Founded in 2019 by former PlanGrid engineers Ghalib Suleiman and Nathan Yergler and backed by Y Combinator, it pairs a no-code interface for business teams with SQL, monitoring, and infrastructure-as-code controls for data engineers.