The table shows the pricing model, not prices, because prices change. Check each vendor page for current plans.
Automationn8n
A visual workflow builder that connects apps, APIs and AI models. Run it yourself or use n8n Cloud.
- Replaces
- Zapier, Make
- Licence
- Sustainable Use License (fair-code, not an OSI open-source licence)
- Hardware
- 4 GB for production (reported)
- Best for
- Visual automation that can drop into code when you need it
- Pricing model
- Free to self-host; paid cloud and business plans
- Checked
- October 25, 2026 (licence and repository)
Watch out: Your own upkeep time is the biggest hidden cost, and the licence restricts some ways of selling n8n as a service. Read it before you resell workflows.
Read my guideProject page
Backend and dataSupabase
A Postgres database with authentication, file storage and APIs, usable hosted or self-hosted.
- Replaces
- Firebase, hosted Postgres backends
- Licence
- Apache-2.0 for the main repository (check each component)
- Hardware
- 4 GB RAM, 8 GB or more recommended (official docs)
- Best for
- App backends that need Postgres, login and file storage
- Pricing model
- Free to self-host; hosted plans, including a free tier
- Checked
- October 25, 2026 (licence and repository)
Watch out: Self-hosting is a multi-service stack, so budget for upkeep and not only the server.
Read my guideProject page
Backend and dataPocketBase
A single-file backend with an embedded database, user accounts, file storage and an admin screen.
- Replaces
- Firebase for small projects
- Licence
- MIT
- Hardware
- Runs on a very small VPS
- Best for
- Small apps and prototypes on a tiny server
- Pricing model
- Free (MIT); self-host only
- Checked
- October 25, 2026 (licence and repository)
Watch out: Built for small and mid-sized apps. Check that a single-server database fits how you expect to grow.
Read my guideProject page
Business appsPlane
Project and issue tracking with boards, cycles and modules for small teams.
- Replaces
- Jira, Linear, ClickUp
- Licence
- AGPL-3.0
- Hardware
- 2 vCPU and 4 GB (Docker guide), 8 GB recommended
- Best for
- Small teams replacing Jira or Linear
- Pricing model
- Free Community edition; paid cloud and paid editions
- Checked
- October 25, 2026 (licence and repository)
Watch out: AGPL-3.0 carries obligations if you modify the code and offer it over a network. Read it first.
Read my guideProject page
Business appsTwenty
An open-source CRM with customisable objects, views and pipelines.
- Replaces
- Salesforce, HubSpot CRM
- Licence
- Mostly AGPL-3.0, with some files under a commercial licence
- Hardware
- Postgres, Redis, a server and a worker (no official RAM figure found)
- Best for
- Small sales teams that want a customisable CRM
- Pricing model
- Free to self-host; paid cloud
- Checked
- October 25, 2026 (licence and repository)
Watch out: Check the feature list against your real sales process before you move any contacts.
Read my guideProject page
Business appsChatwoot
A shared inbox for email, live chat and social messages, with assignment and canned replies.
- Replaces
- Intercom, Zendesk
- Licence
- MIT (Community build)
- Hardware
- 4 GB (official docs)
- Best for
- One shared support inbox for email and chat
- Pricing model
- Free Community edition; paid cloud and paid editions
- Checked
- October 25, 2026 (licence and repository)
Watch out: Some features sit in paid editions. Confirm the Community build covers what you need.
Read my guideProject page
Business appsListmonk
A newsletter and mailing-list manager that sends through an SMTP email service you choose.
- Replaces
- Mailchimp, Kit
- Licence
- AGPL-3.0
- Hardware
- About 512 MB idle, plus Postgres
- Best for
- Newsletters to a list you own, sent through your own SMTP
- Pricing model
- Free; self-host only, and you pay for email sending
- Checked
- October 25, 2026 (licence and repository)
Watch out: Sending email is the hard part. You still need an SMTP provider and good deliverability habits.
Read my guideProject page
AnalyticsUmami
Privacy-focused web analytics with a simple dashboard.
- Replaces
- Google Analytics, paid privacy analytics
- Licence
- MIT
- Hardware
- About 400 MB idle, 2 GB VPS
- Best for
- Simple, privacy-friendly site statistics
- Pricing model
- Free to self-host; paid cloud
- Checked
- October 25, 2026 (licence and repository)
Watch out: Reports are simpler than Google Analytics, so check it answers the questions you actually ask.
Read my guideProject page
AnalyticsPlausible Community Edition
Lightweight, cookie-free web analytics you host yourself.
- Replaces
- Google Analytics, Plausible Cloud
- Licence
- AGPL-3.0
- Hardware
- At least 2 GB, about 1.8 GB idle
- Best for
- Lightweight, cookie-free analytics
- Pricing model
- Free Community Edition; paid Plausible Cloud
- Checked
- October 25, 2026 (licence and repository)
Watch out: The Community Edition is not the same product as Plausible Cloud. Compare features before you choose.
Read my guideProject page
Local AIOllama
Runs open-weight language models on your own computer or server and exposes a local API.
- Replaces
- Some paid AI API calls
- Licence
- MIT
- Hardware
- Depends on the model. Bigger models need much more memory
- Best for
- Trying local models quickly
- Pricing model
- Free to run locally
- Checked
- October 25, 2026 (licence and repository)
Watch out: Local models are usually weaker than the largest cloud models. Test on your real tasks before you switch.
Project page
Local AIllama.cpp
An inference engine for running quantised language models on ordinary CPUs and GPUs.
- Replaces
- Hosted inference for small models
- Licence
- MIT
- Hardware
- Depends on the model and quantisation
- Best for
- Fitting models onto modest hardware if you are happy on the command line
- Pricing model
- Free
- Checked
- October 25, 2026 (licence and repository)
Watch out: Command-line first. Expect more setup than a desktop app.
Project page
Local AILocalAI
A self-hosted API server that accepts OpenAI-style requests and runs models locally.
- Replaces
- Hosted model APIs for some uses
- Licence
- MIT
- Hardware
- Depends on the models you load
- Best for
- Dropping a local server into tools that expect the OpenAI API
- Pricing model
- Free
- Checked
- October 25, 2026 (licence and repository)
Watch out: Compatibility with the OpenAI API is not identical for every feature. Test your client against it.
Project page
Local AIOpen WebUI
A browser chat interface for local and OpenAI-compatible models, with user accounts.
- Replaces
- Hosted chat front ends
- Licence
- Custom licence with branding conditions (read it)
- Hardware
- Light on its own. The model is what needs memory
- Best for
- A ChatGPT-style front end for local models
- Pricing model
- Free to self-host; branding conditions apply
- Checked
- October 25, 2026 (licence and repository)
Watch out: Read the licence before you rebrand it or offer it to clients.
Project page
AutomationActivepieces
A no-code automation builder with a TypeScript framework for writing your own integrations, called pieces.
- Replaces
- Zapier, Make
- Licence
- MIT for the Community Edition, with enterprise features under a commercial licence
- Hardware
- Official docs size it at about 8 GB for the app, plus 1 GB each for PostgreSQL and Redis
- Best for
- No-code automations with an MIT-licensed core
- Pricing model
- Free Community Edition; paid cloud and enterprise plans
- Checked
- October 25, 2026 (licence and repository)
Watch out: Confirm that the features you need are in the free Community Edition and not in the enterprise code.
Project page
AutomationWindmill
A developer platform that turns scripts into APIs, background jobs, workflows and internal screens.
- Replaces
- Retool, Pipedream, Airflow
- Licence
- Mostly AGPL-3.0, with Apache-2.0 parts and proprietary enterprise code
- Hardware
- Docs size workers at about 1 to 2 GB each for light jobs, plus a Postgres database
- Best for
- Developers turning scripts into workflows, jobs and internal tools
- Pricing model
- Free to self-host; paid cloud, support and enterprise licences
- Checked
- October 25, 2026 (licence and repository)
Watch out: The licence differs by folder. Read it before you offer Windmill to clients or modify it.
Project page
Business appsCal.diy (community edition of Cal.com)
A scheduling tool for booking links and calendar sync. It is a fork of Cal.com with the enterprise code removed.
- Replaces
- Calendly
- Licence
- MIT
- Hardware
- No official RAM figure found (a Node.js app with a database)
- Best for
- Personal booking links on a server you run
- Pricing model
- Free (MIT); self-host only
- Checked
- October 25, 2026 (licence and repository)
Watch out: The project says it is meant for personal, non-production use and has no hosted version. For business scheduling it points to Cal.com itself.
Project page
Business appsDocumenso
A document-signing tool for sending contracts and collecting electronic signatures.
- Replaces
- DocuSign
- Licence
- AGPL-3.0
- Hardware
- No official RAM figure found (Docker deployment guide)
- Best for
- Collecting signatures on your own server
- Pricing model
- Free to self-host; paid cloud and enterprise plans
- Checked
- October 25, 2026 (licence and repository)
Watch out: The legal weight of an electronic signature varies by country and document type, so check your own requirements. AGPL-3.0 carries obligations if you modify the code.
Project page
Business appsStirling-PDF
A self-hosted PDF toolkit for merging, splitting, converting, compressing and running OCR on files.
- Replaces
- Online PDF tools, Adobe Acrobat features
- Licence
- MIT core, with proprietary code in separate folders (open-core)
- Hardware
- Docs recommend about 4 GB RAM and 2 or more CPU cores
- Best for
- Merging, splitting, converting and OCR-ing PDFs without uploading them elsewhere
- Pricing model
- Free open-core; paid server and enterprise plans
- Checked
- October 25, 2026 (licence and repository)
Watch out: It is open-core. Single sign-on and some server features are paid, so check that the free build covers your use.
Project page
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