Open-source software
Projects whose core is released under an OSI-approved license such as AGPL, MIT or Apache 2.0. Some also ship commercially licensed enterprise files; each page says so.
- AppFlowyAlternative to Notion
A Notion-style workspace for docs, databases and wikis, with local-first desktop and mobile apps.
AGPL-3.0Self-hostedCloud77kGitHub starsFree tier is limited - PlaneAlternative to Jira
An open-source project and issue tracker with cycles and modules, built as a Jira alternative.
AGPL-3.0Self-hostedCloud61kGitHub starsSome features paywalled - TwentyAlternative to HubSpot
A modern open-source CRM you can self-host and extend through its API.
AGPL-3.0Self-hostedCloud58kGitHub starsSome features paywalled - MattermostAlternative to Slack
A self-hostable team chat platform with channels, threads and integrations, popular for secure and technical teams.
AGPL-3.0Self-hostedCloud39kGitHub starsSome features paywalled - NextcloudAlternative to Dropbox
A self-hosted file sync and sharing platform with an app store for calendar, contacts, mail and chat.
AGPL-3.0Self-hosted37kGitHub starsSome features paywalled - Plausible AnalyticsAlternative to Google Analytics
Lightweight, cookieless, privacy-focused web analytics with a self-hostable Community Edition.
AGPL-3.0Self-hostedCloud29kGitHub starsSome features paywalled - ListmonkAlternative to Mailchimp
A self-hosted newsletter and mailing list manager that ships as a single binary and uses your own SMTP provider.
AGPL-3.0Self-hosted24kGitHub starsFully featured free edition - FormbricksAlternative to Typeform
An open-source survey and feedback tool for in-product and link surveys that you can self-host.
AGPL-3.0Self-hostedCloud13kGitHub starsSome features paywalled - Woodpecker CIAlternative to CircleCI
A lightweight, container-based CI/CD engine that you host yourself and connect to your Git forge.
Apache-2.0Self-hosted8.0kGitHub starsFully featured free edition
9 projects listed. More are added as they are checked against official sources.