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VENTUREGAPS

BEST OPEN SOURCE TOOLS

Free and open-source software alternatives to commercial tools.

294 tools indexed|Updated MAY 2026|► VIEW TOP PICKS

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V

VLC Media Player

FREE

Free media player that plays almost any audio or video format

APPROVED
M

MariaDB

FREE

Community-developed MySQL fork with enhanced features

APPROVED
M

MySQL

FREE

Popular open-source relational database for web applications

APPROVED
A

Apache HTTP Server

FREE

Venerable web server powering websites since the early internet

APPROVED
N

Nginx

FREE

High-performance web server and reverse proxy

APPROVED
C

Calibre

OPEN SRC

E-book library manager that can view, convert, and catalog e-books in most of the major e-book formats and provides a built-in Web server for remote clients

APPROVED
P

Pi-hole

OPEN SRC

Blackhole for Internet advertisements with a GUI for management and monitoring

APPROVED
G

GitLab

OPEN SRC

AI-powered DevSecOps for faster, secure software delivery

APPROVED
A

Apache Airflow

OPEN SRC

Platform to programmatically author, schedule, and monitor workflows

APPROVED
P

Paperless-ngx

OPEN SRC

Scan, index, and archive all of your paper documents with an improved interface (fork of Paperless)

APPROVED
A

Asterisk

OPEN SRC

Easy to use but advanced IP PBX system, VoIP gateway and conference server

APPROVED
G

Ghost

OPEN SRC

A modern platform for professional publishing and newsletters

APPROVED
M

Matomo

OPEN SRC

Web analytics that protects your data and your customers' privacy (alternative to Google Analytics)

APPROVED
M

Metabase

OPEN SRC

Easy way for everyone in your company to ask questions and learn from data

APPROVED
P

PostHog

OPEN SRC

Product analytics, session recording, feature flagging and a/b testing that you can self-host (alternative to Mixpanel, Amplitude, Heap, HotJar, Optimizely)

APPROVED
K

Komga

OPEN SRC

Media server for comics/mangas/BDs with API and OPDS support, a modern web interface for exploring your libraries, as well as a web reader

APPROVED
K

Kamailio

OPEN SRC

The modular SIP server for building scalable VoIP and real-time communication platforms.

APPROVED
A

AdGuard Home

OPEN SRC

Block ads and trackers for your entire home network.

APPROVED
W

Wagtail

OPEN SRC

Django content management system focused on flexibility and user experience

APPROVED
J

Jitsi Meet

OPEN SRC

WebRTC application that uses Jitsi Videobridge to provide high quality, scalable video conferences

APPROVED
F

Freepbx

OPEN SRC

Web-based open source GUI that controls and manages Asterisk

APPROVED
S

SimpleLogin

OPEN SRC

Open source email alias solution to protect your email address. Comes with browser extensions and mobile apps

APPROVED
E

Element

OPEN SRC

Fully-featured Matrix client for Web, iOS & Android

APPROVED
C

Cal.com

OPEN SRC

Open source Calendly alternative for booking meetings

APPROVED
S

Superset

OPEN SRC

Modern data exploration and visualization platform

APPROVED
O

openSIPS

OPEN SRC

SIP proxy/server for voice, video, IM, presence and any other SIP extensions

APPROVED
K

Kavita

OPEN SRC

Cross-platform e-book/manga/comic/pdf server and web reader with user management, ratings and reviews, and metadata support.

APPROVED
U

Umbraco

OPEN SRC

The friendly CMS. Free and open source with an amazing community.

APPROVED
J

Joomla!

OPEN SRC

Open-source CMS with deep content management and multilingual support

APPROVED
P

phpBB

OPEN SRC

Flat-forum bulletin board software solution that can be used to stay in touch with a group of people or can power your entire website

APPROVED
F

FreeSWITCH

OPEN SRC

Scalable open source cross-platform telephony platform

APPROVED
M

Mailcow

OPEN SRC

Mail server suite based on Dovecot, Postfix and other open source software, that provides a modern Web UI for administration

APPROVED
R

Rocket.Chat

OPEN SRC

Communications platform that puts data protection first (alternative to Gitter.im and Slack).

APPROVED
C

Centrifugo

OPEN SRC

Language-agnostic real-time messaging (Websocket or SockJS) server.

APPROVED
D

Druid

OPEN SRC

Distributed, column-oriented, real-time analytics data store

APPROVED
R

Redash

OPEN SRC

Connect and query your data sources, build dashboards to visualize data and share them with your company

APPROVED
M

Mayan EDMS

OPEN SRC

Electronic document management system for your documents with preview generation, OCR, and automatic categorization among other features.

ADEQUATE
B

BuddyPress

OPEN SRC

Powerful plugin that takes your WordPress.org powered site beyond the blog with social-network features like user profiles, activity streams, user groups, and more

ADEQUATE
W

Weechat

OPEN SRC

Fast light and extensible IRC client for the terminal

ADEQUATE
D

Datasette

OPEN SRC

Explore and publish data with easy import and export and database management

ADEQUATE
G

Gotenberg

OPEN SRC

Developer-friendly API to interact with powerful tools like Chromium and LibreOffice for converting numerous document formats (HTML, Markdown, Word, Excel, etc.) into PDF files, and more

ADEQUATE
T

TYPO3

OPEN SRC

The professional open source CMS for complex websites.

ADEQUATE
P

Pimcore

OPEN SRC

Multi-channel experience and engagement management platform

ADEQUATE
M

Misskey

OPEN SRC

Decentralized app-like microblogging server/SNS for the Fediverse, using the ActivityPub protocol like GNU social and Mastodon

ADEQUATE
S

Simple Machines Forum

OPEN SRC

Free, professional grade software package that allows you to set up your own online community within minutes

ADEQUATE
B

BigBlueButton

OPEN SRC

Supports real-time sharing of audio, video, slides (with whiteboard controls), chat, and the screen. Instructors can engage remote students with polling, emojis, and breakout rooms

ADEQUATE
Y

Yeti-Switch

OPEN SRC

Transit class4 softswitch(SBC) with integrated billing and routing engine and REST API.

ADEQUATE
M

Mailman

OPEN SRC

Manage electronic mail discussion and e-newsletter lists

ADEQUATE
R

Roundcube

OPEN SRC

Browser-based IMAP client with an application-like user interface

ADEQUATE
D

docker-mailserver

OPEN SRC

Production-ready fullstack but simple mail server (SMTP, IMAP, LDAP, Antispam, Antivirus, etc.) running inside a container. Only configuration files, no SQL database

ADEQUATE

WHAT ARE OPEN SOURCE TOOLS?

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