AC
Alfresco Community Edition
LGPL-3.0 ·★ 214
hard

Open source Enterprise Content Management platform for document storage, versioning, metadata, records management, and workflow. A self-hostable alternative to SharePoint for organisations that need serious document governance without Microsoft licensing

AP
Appwrite
BSD-3-Clause ·★ 56.2k
medium

Open-source backend platform providing authentication, databases, storage, serverless functions, messaging, and realtime APIs. A self-hostable Firebase alternative

BC
Backdrop CMS
GPL-2.0 ·★ 1k
medium

GPL-2.0 Drupal 7 fork for small to medium sites. Keeps Drupal's content flexibility while reducing infrastructure complexity — no composer-first workflow, built-in layouts, and a gentler upgrade path

BA
Baserow
MIT ·★ 4.9k
medium

Self-hosted no-code database and app builder. MIT-licensed with no row limits, real-time collaboration, built-in automations, and seven view types including Kanban and Calendar

BO
BookStack
MIT ·★ 18.8k
easy

Free, self-hosted wiki with a Books/Chapters/Pages hierarchy, built-in diagrams, SAML/OIDC auth, and role-based permissions. Runs on PHP and MySQL

BU
Bugzilla
MPL-2.0 ·★ 828
medium

Battle-tested open source bug tracker originally built by Mozilla in 1998. Advanced search, custom fields, email notifications, time tracking, and a flexible workflow — one of the most capable self-hosted issue trackers still in active use

CA
Cal.com
AGPL-3.0 ·★ 34k+
medium

Open-source Calendly alternative with unlimited event types on the free tier, Stripe payments, routing forms, and a full API. Self-hosting requires PostgreSQL and Redis

CH
Chatwoot
MIT ·★ 29.8k
medium

Open-source customer support platform with a shared inbox across email, live chat, WhatsApp, Facebook, Twitter, and more. Self-hosted alternative to Intercom and Zendesk with a clean agent UI

CH
ChiefOnboarding
AGPL-3.0 ·★ 894
medium

Self-hosted employee onboarding platform with automated sequences, Slack bot integration, and account provisioning. Build structured new-hire journeys with tasks, resources, and timed messages without a HR software subscription

CO
CourseLit
AGPL-3.0 ·★ 1.2k
medium

Open-source alternative to Teachable and Thinkific. Self-host your own course selling platform with digital downloads, communities, and email — no per-transaction fees

DI
Dittofeed
MIT ·★ 2.8k
medium

Open source customer messaging automation platform. Build event-triggered journeys for email, SMS, push, and webhooks — a self-hostable alternative to Braze, Customer.io, and Iterable without the per-MAU pricing

EL
eLabFTW
AGPL-3.0 ·★ 1.3k
easy

Open source electronic lab notebook for research teams. Record experiments, manage a sample and protocol database, timestamp results for legal proof-of-existence, and collaborate with colleagues without paying per-seat fees

FO
Formbricks
AGPL-3.0 ·★ 12.3k
easy

Open-source survey platform with in-product user targeting and link-based forms. Self-host to collect NPS, CSAT, and custom feedback with full data ownership

FH
Frappe Helpdesk
AGPL-3.0 ·★ 3.2k
medium

Open source customer support platform built on the Frappe framework. Ticket management, SLA tracking, automation rules, a customer portal, and a clean agent interface — all self-hostable and free for teams that do not want to pay Zendesk's per-agent fees

FR
FreeScout
AGPL-3.0 ·★ 4.3k
easy

Self-hosted shared inbox and help desk built with PHP/Laravel. A close open source replica of Help Scout — conversation threads, collision detection, saved replies, and a module system — without the per-agent subscription cost

IN
Invoice Ninja
Elastic License 2.0 ·★ 9.8k
medium

Self-hosted invoicing, quotes, expenses, and payment collection for freelancers and small businesses. Unlimited clients and users when self-hosted. 50+ payment gateways, time tracking, and a client portal included

IT
ITFlow
GPL-3.0 ·★ 941
medium

Open source IT documentation, ticketing, invoicing, and accounting platform built specifically for managed service providers and small IT teams

LI
LibreDesk
AGPL-3.0 ·★ 2.5k
medium

Self-hosted customer support desk with live chat, email, SLA management, and SSO built in. Free, open source, ships as a single Go binary

LI
Listmonk
AGPL-3.0 ·★ 21k
medium

Self-hosted newsletter and mailing list manager. Single Go binary, PostgreSQL, no per-subscriber fees, SMTP-agnostic, with a transactional email API for app-triggered messages

MA
mailcow
GPL-3.0 ·★ 12.8k
medium

Self-hosted email suite bundling Postfix, Dovecot, Rspamd, SOGo, and ClamAV in a single Docker Compose stack. Full web UI for domain and mailbox management

MA
MantisBT
GPL-2.0 ·★ 1.8k
easy

Lightweight PHP bug tracker with email integration, custom fields, time tracking, and a plugin system. One of the longest-standing open source issue trackers — simple to deploy and actively maintained after 20+ years

MA
Matomo
GPL-3.0 ·★ 20k
medium

The most feature-complete self-hosted analytics platform. GDPR-approved by EU authorities for cookieless operation. Free core, premium plugins sold separately

MA
Mautic
GPL-3.0 ·★ 9.8k
hard

Open-source marketing automation platform for email campaigns, drip sequences, lead scoring, and contact segmentation. Self-host your marketing stack with no per-contact fees

ME
Metabase
AGPL-3.0 ·★ 47.5k
easy

Open-source business intelligence tool for building dashboards and running queries without a data analyst on call. Visual query builder for non-technical users, full SQL editor for those who want it

NE
Nextcloud
AGPL-3.0 ·★ 35.5k
medium

Self-hosted productivity suite covering file sync, calendar, contacts, video calls, and collaborative document editing. Free community edition for self-hosters; enterprise subscriptions for organisations needing support SLAs

NO
NocoDB
AGPL-3.0 ·★ 63.1k
easy

Open-source Airtable alternative that turns any SQL database into a spreadsheet-style interface. Grid, kanban, gallery, calendar, and form views with role-based access and REST API — no data migration needed

OD
ONLYOFFICE Docs
AGPL-3.0 ·★ 6.6k
easy

Self-hosted document server for editing and collaborating on docs, spreadsheets, and presentations in the browser. Connects to Nextcloud and 40+ other platforms

OT
OTOBO
GPL-3.0 ·★ 324
hard

Open source web-based ticketing and ITSM platform. Community successor to OTRS after it went commercial — handles email-based support queues, SLAs, escalations, and ITIL-aligned service management for help desks and IT teams

PA
Papermark
AGPL-3.0 ·★ 8.4k
medium

Open source DocSend alternative for sharing documents via trackable links. Share pitch decks and proposals with page-by-page analytics, custom domains, password protection, and email capture — without paying DocSend's per-document fees

PA
Passbolt
AGPL-3.0 ·★ 5.9k
medium

Open-source team password manager built on OpenPGP end-to-end encryption. Share credentials with granular permissions, audit every access, and keep private keys on user devices. Community edition is free with unlimited users

PL
Plane
AGPL-3.0 ·★ 50.1k
medium

Open-source project management with issues, cycles, modules, and analytics. Self-hosted Jira alternative used by Sony, Accenture, and government agencies

PS
Psono
Apache-2.0 ·★ 100
medium

Self-hosted team password manager with multi-layer client-side encryption. Enterprise edition with SSO, LDAP, and audit logging is free up to 10 users. Business tier starts at $3/user/month

RT
Request Tracker
GPL-2.0 ·★ 1.1k
hard

Battle-tested open-source ticketing system with 20+ years of production use. Email-driven queues, custom workflows, SLA management, asset tracking, and 400+ free extensions. Written in Perl

RI
Roundup Issue Tracker
MIT ·★ 44
medium

Flexible Python-based issue tracker with web, email, REST, and command-line interfaces. Configurable data model lets you shape it into a bug tracker, help desk, or project management tool without modifying core code

RU
RustDesk
AGPL-3.0 ·★ 115k
easy

Open-source remote desktop software with a self-hosted relay server. Route all traffic through your own infrastructure. Replaces TeamViewer and AnyDesk. Client runs on all major platforms

SP
Stirling PDF
MIT ·★ 79.7k
easy

Locally hosted web application for PDF manipulation with 50+ operations. Split, merge, compress, OCR, convert, watermark, and sign PDFs with nothing sent to external servers

SU
Supabase
Apache-2.0 ·★ 103k
medium

Open-source Firebase alternative built on Postgres. Provides a database, authentication, auto-generated REST and GraphQL APIs, file storage, edge functions, and realtime subscriptions

TE
Teampass
GPL-3.0 ·★ 1.8k
easy

Self-hosted team password manager with folder-based organisation, role and group access controls, and an audit trail. Built for teams that need shared credentials without paying per-user fees for a cloud password manager

TW
Twenty
AGPL-3.0 ·★ 47.6k
medium

Open-source CRM with a modern interface and fully customisable data model. Define custom objects, fields, and relationships, then manage contacts, deals, and pipelines on your own infrastructure

VI
Vikunja
AGPL-3.0 ·★ 4.4k
easy

Self-hosted task and project manager with list, Kanban, Gantt, and table views. Single Go binary, CalDAV sync, and import from Todoist, Trello, and Microsoft To-Do

WE
WeKan
MIT ·★ 21k
easy

Open-source kanban board for visual task and project management. Boards, lists, cards, swimlanes, and checklists with a privacy-first, self-hosted approach

WI
Wiki.js
AGPL-3.0 ·★ 28.4k
medium

Self-hosted wiki on Node.js with Git sync, flexible page structure, and deep authentication support. Multiple editors, 50+ integrations, and no forced content hierarchy

WO
WordPress
GPL-2.0 ·★ 21k
easy

The CMS powering 43% of the web. Self-hosted, GPL-licensed, with 60,000+ plugins, WooCommerce, and no platform fee. Requires active maintenance to stay secure

ZA
Zammad
AGPL-3.0 ·★ 5.6k
medium

Open-source helpdesk and customer support ticketing system with multi-channel inbox, SLA management, and knowledge base. Self-host your support operation without per-agent subscription fees