GitHub has free alternatives to almost every tool you're paying for. I found 10 repos that can wipe $500/month off your software bill. steal this stack: 1. github.com/AppFlowy-IO/AppFl… Replaces: Notion ($10–15/user/month). The closest open-source clone of Notion there is. Docs, wikis, databases, kanban boards, calendar views, and a real desktop app, all local-first so your workspace lives on your machine instead of someone's cloud. Drop a non-technical teammate in front of it and they're productive in 20 minutes. 60K+ stars. 2. github.com/nocodb/nocodb Replaces: Airtable ($20–45/user/month). Point it at a database and it becomes a slick spreadsheet with grid, gallery, form, and kanban views, row permissions, automations, and a REST API. Everything Airtable does, on a database you own. Scales to real teams without the per-seat bleed. 50K+ stars. 3. github.com/knadh/listmonk Replaces: Mailchimp ($13–100+/month and climbing with list size). A self-hosted newsletter and mailing-list manager that handles millions of subscribers on a single server. Mailchimp punishes you for growing your list. Listmonk charges you the cost of the box it runs on. One binary, done. 16K+ stars. 4. github.com/calcom/cal.diy Replaces: Calendly ($12–16/user/month). The MIT community edition of Cal. com, split off in 2026 when the main project went closed. Booking pages, team scheduling, reminders, payment links, all self-hosted and yours. The full Calendly experience with no monthly seat fee. 48K+ stars. 5. github.com/formbricks/formbr… Replaces: Typeform ($29+/month). Beautiful surveys and forms, plus in-app surveys that fire based on what users actually do, all self-hosted so the responses never leave your server. Typeform charges per response once you grow. This doesn't. 10K+ stars. 6. github.com/activepieces/acti… Replaces: Zapier (bills per task, climbs fast). Connect your apps and automate entire workflows with a clean visual builder and hundreds of integrations, running on your own server with no per-action fee. The automation tax every growing business quietly pays, deleted. 15K+ stars. 7. github.com/outline/outline Replaces: Confluence and Notion for team wikis ($5–11/user/month). The most polished self-hosted knowledge base there is. Slash commands, nested pages, real-time editing, full-text search, and a proper API. The team wiki that feels like Notion but runs on infrastructure you control. 33K+ stars. 8. github.com/makeplane/plane Replaces: Linear and Jira ($8–15/user/month). A clean, fast project tracker with issues, sprints, cycles, and roadmaps, self-hostable with no per-seat cost. Linear killed its free tier and tightened limits. Plane gives small teams the same flow for the price of a server. 30K+ stars. 9. github.com/documenso/documen… Replaces: DocuSign (billed per envelope, $10–25/month). Upload a PDF, drop signature fields, send, and get back a sealed document with a full audit trail, all self-hosted and legally compliant. The per-signature fee just stopped existing. 13K+ stars. 10. github.com/chatwoot/chatwoot Replaces: Intercom and Zendesk ($74+/agent/month). A full customer-support suite, live chat, shared inbox, help center, and bots across email, WhatsApp, and socials. The per-agent pricing on the paid tools punishes you for every hire. Chatwoot runs on your server with no seat tax. 20K+ stars. Add it up: that's well past $500 a month, gone. The only bill left is the server they all run on.