Open source
Open-source alternatives worth self-hosting
Open source swaps a subscription for maintenance. These projects genuinely replace their commercial counterparts — but only if someone on your side will own updates, backups and security patches. If nobody will, pay for the hosted product; it is cheaper than an outage.
| Project | What it is | Replaces | Source |
|---|---|---|---|
| Nextcloud | Self-hosted file sync, calendar and collaboration suite. | Dropbox, Google Drive | repo ↗ |
| Seafile | Self-hosted file sync focused on speed and reliability. | Dropbox | repo ↗ |
| ownCloud | The original self-hosted file-sync platform Nextcloud forked from. | Dropbox | repo ↗ |
| File Browser | Minimal self-hosted web file manager for a single server. | Dropbox | repo ↗ |
| osTicket | Long-running open-source support ticket system. | Zendesk, Freshdesk | repo ↗ |
| FreeScout | Self-hosted shared inbox and helpdesk, a Help Scout alternative. | Help Scout, Zendesk | repo ↗ |
| Zammad | Open-source helpdesk with strong multi-channel support. | Zendesk | repo ↗ |
| Chatwoot | Open-source customer engagement and live chat suite. | Intercom, Zendesk | repo ↗ |
| Bitwarden | Open-source, audited password manager with a usable free tier. | 1Password, LastPass | repo ↗ |
| Vaultwarden | Lightweight self-hosted server compatible with Bitwarden clients. | 1Password, LastPass | repo ↗ |
| KeePassXC | Fully offline encrypted vault stored as a local file. | 1Password, LastPass | repo ↗ |
| Passbolt | Open-source password manager built for team sharing. | 1Password | repo ↗ |
| Akaunting | Self-hosted open-source accounting with a modular design. | QuickBooks | repo ↗ |
| Invoice Ninja | Open-source invoicing, quotes and payments platform. | QuickBooks, freshbooks | repo ↗ |
| Firefly III | Self-hosted personal finance manager and budgeting tool. | QuickBooks | repo ↗ |
| Twenty | Modern open-source CRM built as a Salesforce alternative. | Salesforce, HubSpot | repo ↗ |
| EspoCRM | Mature open-source CRM that is quick to self-host. | Salesforce | repo ↗ |
| SuiteCRM | Long-established open-source CRM forked from SugarCRM. | Salesforce | repo ↗ |
| Odoo | Open-source business suite covering CRM, ERP and more. | Salesforce | repo ↗ |
| n8n | Self-hostable workflow automation with code steps built in. | Zapier, make | repo ↗ |
| Activepieces | Open-source automation that is friendlier than n8n. | Zapier | repo ↗ |
| Windmill | Open-source platform turning scripts into workflows and UIs. | Zapier, Retool | repo ↗ |
| Node-RED | Flow-based programming, popular for IoT and event wiring. | Zapier | repo ↗ |
| Grafana | The open-source standard for dashboards and visualisation. | Datadog | repo ↗ |
| Prometheus | Open-source metrics collection and alerting, the CNCF standard. | Datadog | repo ↗ |
| SigNoz | Open-source metrics, traces and logs in a single product. | Datadog, New Relic | repo ↗ |
| Uptime Kuma | Self-hosted uptime monitoring with a very clean interface. | Datadog, Pingdom | repo ↗ |
| Netdata | Real-time infrastructure monitoring with per-second resolution. | Datadog | repo ↗ |
| Zabbix | Enterprise-grade open-source infrastructure monitoring. | Datadog | repo ↗ |
| Mattermost | Self-hosted team chat that closely mirrors Slack. | Slack | repo ↗ |
| Rocket.Chat | Open-source team chat plus customer-facing livechat. | Slack, Intercom | repo ↗ |
| Zulip | Topic-threaded chat that stays readable at scale. | Slack | repo ↗ |
| Element | Matrix-based secure chat with federation and E2E encryption. | Slack | repo ↗ |
| OpenProject | Open-source project management with Gantt and portfolio views. | Jira, Monday.com | repo ↗ |
| Plane | Modern open-source issue tracking, a Jira and Linear alternative. | Jira, Linear | repo ↗ |
| Taiga | Open-source agile project management for scrum and kanban. | Jira | repo ↗ |
| Vikunja | Self-hosted task management with list, kanban and gantt views. | Asana, Trello | repo ↗ |
| Focalboard | Self-hosted project boards, an open Trello and Notion alternative. | Trello, Notion | repo ↗ |
| Wekan | Open-source kanban board you can host yourself. | Trello | repo ↗ |
| Joplin | Open-source notes with encrypted sync and Evernote import. | Evernote | repo ↗ |
| Logseq | Outliner-style local-first knowledge base. | Notion, Evernote | repo ↗ |
| Standard Notes | End-to-end encrypted notes on every tier. | Evernote | repo ↗ |
| AppFlowy | Open-source Notion alternative, local-first by design. | Notion | repo ↗ |
| Anytype | Local-first encrypted workspace and knowledge graph. | Notion | repo ↗ |
| Outline | Team wiki and knowledge base you can self-host. | Confluence, Notion | repo ↗ |
| Trilium Notes | Hierarchical note-taking for building personal knowledge bases. | Evernote | repo ↗ |
| NocoDB | Turns an existing Postgres or MySQL database into a spreadsheet UI. | Airtable | repo ↗ |
| Baserow | Open-source Airtable alternative with unlimited self-hosted users. | Airtable | repo ↗ |
| Grist | Spreadsheet-database hybrid with real Python formulas. | Airtable | repo ↗ |
| Teable | Postgres-backed no-code database with an Airtable-like interface. | Airtable | repo ↗ |
| Directus | Open-source data platform and headless CMS over any SQL database. | Airtable, Contentful | repo ↗ |
| Formbricks | Open-source surveys built for in-product research. | Typeform, SurveyMonkey | repo ↗ |
| LimeSurvey | Long-established open-source survey platform. | SurveyMonkey | repo ↗ |
| Cal.com | Open-source scheduling that can be self-hosted and white-labelled. | Calendly | repo ↗ |
| Easy!Appointments | Self-hosted appointment booking for service businesses. | Calendly | repo ↗ |
| Documenso | Open-source e-signature platform you can self-host. | DocuSign | repo ↗ |
| Bruno | Offline API client storing collections as files in your repo. | Postman | repo ↗ |
| Insomnia | Polished API client with strong GraphQL and gRPC support. | Postman | repo ↗ |
| Hoppscotch | Browser-based API client that can be self-hosted. | Postman | repo ↗ |
| Keycloak | The open-source standard for self-hosted SSO, backed by Red Hat. | Okta, Auth0 | repo ↗ |
| Authentik | Modern self-hosted identity provider, friendlier than Keycloak. | Okta, Auth0 | repo ↗ |
| Zitadel | Open-source identity with multi-tenancy and a managed cloud. | Okta, Auth0 | repo ↗ |
| SuperTokens | Open-source authentication built for developers to embed. | Auth0 | repo ↗ |
| Ory | Open-source identity and access infrastructure. | Auth0, Okta | repo ↗ |
| Coolify | Self-hosted PaaS — git-push deploys on your own VPS. | Heroku, Vercel | repo ↗ |
| Dokku | Minimal self-hosted PaaS built on Docker. | Heroku | repo ↗ |
| CapRover | Self-hosted PaaS with a web UI and one-click apps. | Heroku | repo ↗ |
| Listmonk | Self-hosted newsletter and mailing-list manager, very fast. | Mailchimp | repo ↗ |
| Mautic | Open-source marketing automation platform. | HubSpot, Mailchimp | repo ↗ |
| Plausible | Privacy-friendly, cookie-free web analytics. | Google Analytics | repo ↗ |
| Umami | Lightweight self-hosted web analytics. | Google Analytics | repo ↗ |
| Matomo | Full-featured analytics you can host yourself. | Google Analytics | repo ↗ |
| PostHog | Product analytics, session replay and feature flags. | Google Analytics, Amplitude | repo ↗ |
| Penpot | Open-source design and prototyping platform, a Figma alternative. | Figma | repo ↗ |
| Excalidraw | Hand-drawn style virtual whiteboard, self-hostable. | Miro, Figma | repo ↗ |
| tldraw | Infinite canvas whiteboard you can embed in your own product. | Miro | repo ↗ |
| Ghost | Publishing platform with newsletters and memberships built in. | WordPress, Squarespace | repo ↗ |
| Strapi | Open-source headless CMS with a customisable admin. | WordPress, Contentful | repo ↗ |
| Payload | TypeScript-native headless CMS and application framework. | WordPress, Contentful | repo ↗ |
| Metabase | Open-source BI that non-technical people actually use. | Tableau, Looker | repo ↗ |
| Apache Superset | Open-source data exploration and dashboarding at scale. | Tableau, Power BI | repo ↗ |
| Redash | Query, visualise and share results from any data source. | Tableau | repo ↗ |
| Lightdash | Open-source BI built on top of your dbt project. | Looker | repo ↗ |
| Cap | Open-source screen recorder and Loom alternative. | Loom | repo ↗ |
| OpenRefine | Powerful open-source desktop tool for cleaning and reconciling messy data. | repo ↗ | |
| Medusa | Open-source commerce engine for custom storefronts. | Shopify | repo ↗ |
| Saleor | GraphQL-first open-source commerce platform. | Shopify | repo ↗ |
| WooCommerce | The WordPress commerce plugin, self-hosted and extensible. | Shopify | repo ↗ |
The maintenance tax nobody mentions
- Server cost is the small part — your time is the expensive part
- Security patching stops being optional once the service faces the internet
- Backups you have never restored from are not backups
We list open-source options because they are often the right answer. We say this because they are not always the right answer.
Questions people actually ask
Are open-source alternatives really free?
The software is free; running it is not. Self-hosting costs a server — roughly $5–20 a month for most of these — plus your own time for updates, backups and security patches. That is the honest trade: you swap a subscription for maintenance work.
Which open-source alternatives are production-ready?
The projects listed here are established with active development. The realistic test is not features but operations: if nobody on your team wants to own updates and backups, a hosted product is the better answer even at a higher price.
Can I self-host without a sysadmin?
For several of these, yes. Managed hosting providers will run the same open-source software for you for a monthly fee, which keeps the data-ownership benefit without the maintenance burden — at that point you are comparing their price against the commercial product's.
What is the best open-source ticketing system?
osTicket and FreeScout are the two most commonly deployed. osTicket is the older, heavier option with more configuration; FreeScout behaves like a shared inbox and is closer to Help Scout in feel. Both replace the core of a paid helpdesk for the cost of a small server.