OSI-licensed only
Open-Source Alternatives to Popular Software
Looking to self-host, avoid per-seat pricing or keep your data on your own servers? These pages list 177 open-source projects that replace 30widely used tools. Each one names the licence as shown in the project's repository, what it's best at and where it falls short.
Airtable alternatives
6 open-source options
Baserow, Teable, Grist, Mathesar…
See the listAsana alternatives
7 open-source options
OpenProject, Plane, Leantime, Taiga…
See the listAuth0 alternatives
9 open-source options
Keycloak, authentik, Ory Kratos, ZITADEL…
See the listCalendly alternatives
7 open-source options
Cal.diy, Easy!Appointments, Tymeslot, Thunderbird Appointment…
See the listConfluence alternatives
7 open-source options
Docmost, BookStack, Wiki.js, XWiki…
See the listDiscord alternatives
7 open-source options
Stoat, Spacebar, Fluxer, Matrix Synapse…
See the listDropbox alternatives
7 open-source options
Nextcloud, Seafile, Syncthing, ownCloud Infinite Scale (oCIS)…
See the listElasticsearch alternatives
7 open-source options
OpenSearch, Meilisearch, Typesense, Manticore Search…
See the listFigma alternatives
5 open-source options
Penpot, Graphite, Excalidraw, Quant-UX…
See the listFirebase alternatives
6 open-source options
Supabase, Appwrite, Parse Server, Nhost…
See the listGephi alternatives
8 open-source options
Cytoscape, Cytoscape.js, Graphia, Tulip…
See the listGitHub alternatives
7 open-source options
Gitea, Forgejo, GitLab, Gogs…
See the listGrammarly alternatives
6 open-source options
LanguageTool, Harper, Vale, proselint…
See the listISPConfig alternatives
6 open-source options
Virtualmin, HestiaCP, CyberPanel, Ajenti…
See the listJenkins alternatives
7 open-source options
Woodpecker CI, Concourse, Tekton Pipelines, Argo Workflows…
See the listKeycloak alternatives
8 open-source options
authentik, ZITADEL, Ory Kratos, Authelia…
See the listMicrosoft Office alternatives
6 open-source options
LibreOffice, ONLYOFFICE Docs, Collabora Online, Apache OpenOffice…
See the listMinIO alternatives
6 open-source options
Garage, SeaweedFS, RustFS, Ceph…
See the listMiro alternatives
7 open-source options
Excalidraw, AFFiNE, WBO (Whitebophir), draw.io (diagrams.net)…
See the listNotion alternatives
9 open-source options
AppFlowy, AFFiNE, Docmost, SiYuan…
See the listOPNsense alternatives
5 open-source options
pfSense CE, OpenWrt, VyOS, NethSecurity…
See the listPostman alternatives
6 open-source options
Bruno, Hoppscotch, Insomnia, Yaak…
See the listQlikView alternatives
6 open-source options
Metabase, Apache Superset, Grafana, Evidence…
See the listSkype alternatives
7 open-source options
Jitsi Meet, Element, Signal Desktop, Jami…
See the listSlack alternatives
6 open-source options
Zulip, Rocket.Chat, Mattermost, Matrix Synapse…
See the listTrello alternatives
7 open-source options
WeKan, Kanboard, Vikunja, Taiga…
See the listTypeform alternatives
7 open-source options
Formbricks, HeyForm, OpnForm, LimeSurvey…
See the listWordPress alternatives
7 open-source options
Ghost, Drupal, Joomla, Grav…
See the listZapier alternatives
7 open-source options
Activepieces, Windmill, Node-RED, Huginn…
See the listZoom alternatives
7 open-source options
Jitsi Meet, BigBlueButton, Galene, MiroTalk P2P…
See the listOpen-source alternatives: FAQ
Quick answers to common questions
What counts as an open-source alternative here?
Only projects whose repository carries a licence approved by the Open Source Initiative, such as MIT, Apache-2.0, GPL, AGPL or MPL. Every page lists at least 5 of them. Tools with public code under source-available licences (BSL, SSPL, Fair Source and similar) are shown separately and never counted as open source.
Are open-source alternatives free?
The software is free to use, study, change and share under its licence. Running it still costs something: a server, upgrades and backups, unless you pay for a hosted or supported edition, which many of these projects offer.
How are the licences checked?
Each project's licence is read from its own repository page or LICENSE file, and the date of the last check is shown on every page. Archived or explicitly unmaintained projects are left out.
Can I suggest a project?
Yes. Submit it through TechLogHub's submit page. Open-source projects listed on TechLogHub are linked from these pages when they fit.