Open-source alternatives
Free open-source alternatives to paid SaaS
67 proven open-source tools that replace expensive subscriptions. Same job, $0 licence — you pay only for the server. Sorted by GitHub stars, so you can see which ones real teams trust.
| Tool | Replaces | GitHub ★ |
|---|---|---|
| n8nWorkflow automation | Zapier + Make | 206,521 |
| OllamaRun LLMs locally | OpenAI API | 182,067 |
| DifyAI workflow builder | OpenAI + Chatbase + Voiceflow | 157,730 |
| LangflowLLM app builder | OpenAI + Zapier AI | 155,453 |
| Open WebUIChatGPT-style UI for local LLMs | ChatGPT Team | 153,813 |
| ImmichPhoto backup | Google Photos | 115,477 |
| SupabasePostgres backend | Firebase | 111,020 |
| Uptime KumaUptime monitoring | Pingdom + StatusPage | 92,068 |
| LobeChatAI chat platform | ChatGPT + Poe | 82,949 |
| AppFlowyDocs + project mgmt | Notion + Asana | 77,077 |
| GrafanaDashboards / observability | Datadog | 77,042 |
| StrapiHeadless CMS | Contentful + Sanity | 73,271 |
| PrometheusMetrics | Datadog | 66,342 |
| NocoDBDatabase / spreadsheet hybrid | Airtable | 65,163 |
| CoolifySelf-hosted PaaS | Heroku + Vercel | 62,520 |
| PlaneProject management | Jira + Asana | 60,291 |
| GiteaGit hosting | GitHub (private) | 58,270 |
| AppwriteBackend platform | Firebase | 57,546 |
| FlowiseLLM flow builder | Voiceflow + Botpress | 55,483 |
| Cal.comScheduling | Calendly | 48,826 |
| Rocket.ChatTeam chat | Slack | 46,207 |
| ToolJetInternal tools builder | Retool | 41,027 |
| AppsmithInternal tools builder | Retool | 40,992 |
| OutlineTeam wiki | Notion + Confluence | 40,786 |
| PhotoPrismPhoto management | Google Photos | 40,268 |
| PostHogProduct analytics | Mixpanel + Amplitude | 40,112 |
| MattermostTeam chat | Slack | 39,247 |
| UmamiWeb analytics | Google Analytics + Mixpanel | 39,130 |
| PortainerDocker management | Docker Desktop teams | 38,615 |
| DirectusHeadless CMS + data platform | Contentful | 38,006 |
| ChatwootCustomer support inbox | Intercom + Zendesk | 37,444 |
| KeycloakIdentity / SSO | Auth0 + Okta | 37,104 |
| NextcloudFile sync + share | Dropbox + Google Drive | 36,978 |
| MedusaEcommerce platform | Shopify | 36,553 |
| File BrowserWeb file manager | Dropbox | 35,930 |
| DokkuPaaS | Heroku | 32,158 |
| Jitsi MeetVideo calls | Zoom | 30,036 |
| PlausibleWeb analytics | Google Analytics | 29,284 |
| Actual BudgetPersonal finance | YNAB + Mint | 29,262 |
| BudibaseInternal tools builder | Retool + PowerApps | 28,331 |
| FocalboardProject management | Trello + Notion | 26,492 |
| AuthentikIdentity / SSO | Auth0 + Okta | 25,816 |
| Firefly IIIPersonal finance | Mint + YNAB | 24,801 |
| ListmonkNewsletter / mailing manager | Mailchimp + ConvertKit | 23,664 |
| SaleorEcommerce platform | Shopify | 23,399 |
| MatomoWeb analytics | Google Analytics | 21,920 |
| DocmostTeam wiki | Confluence + Notion | 21,857 |
| TeableAirtable alternative | Airtable | 21,856 |
| LiveKitReal-time video/audio infra | Twilio + Agora | 21,251 |
| WindmillScripts + workflows | Zapier + Retool | 18,089 |
| ZincSearchSearch engine | Elasticsearch | 17,897 |
| PipecatReal-time voice AI | Vapi + Retell AI | 16,146 |
| SeafileFile sync | Dropbox | 15,303 |
| Ory KratosAuth | Auth0 | 13,904 |
| ElementEncrypted chat | Slack + WhatsApp | 13,538 |
| FormbricksSurvey + experience mgmt | Typeform + Qualtrics | 13,051 |
| OwncastLive streaming | Twitch | 11,569 |
| TypebotChatbot builder | Intercom + Landbot | 10,468 |
| HealthchecksCron monitoring | Cronitor | 10,379 |
| Invoice NinjaInvoicing | FreshBooks + QuickBooks | 10,205 |
| VendureEcommerce framework | Shopify | 8,495 |
| CraterInvoicing | FreshBooks | 8,349 |
| HedgeDocCollaborative docs | Notion + Google Docs | 7,458 |
| GLPIIT helpdesk | ServiceNow + Freshservice | 6,419 |
| BaserowOpen-source Airtable | Airtable | 6,068 |
| MediaCMSVideo platform | YouTube (private) | 5,132 |
| LimeSurveySurveys | SurveyMonkey + Typeform | 3,741 |