Applications
The software people actually open — the layer where AI stops being infrastructure and becomes a product.
The largest layer by headcount and the most crowded. It is also where subscription creep happens fastest, because every app is now $10 to $30 a seat a month and nobody audits the total.
27 decisions · 110 verified alternatives · 24 categories
Every decision at this layer
Ranked by how self-sufficient the leading alternative is. The score is a published rubric, not an opinion — see methodology.
Microsoft 365 → LibreOffice
The mature, fully open-source desktop office suite that runs entirely on your own machine.
Free / runs locally
GitHub → Forgejo
Community-governed, copyleft self-hosted Git forge.
Free / self-host
Adobe Photoshop → GIMP
The long-standing open-source image editor for photo retouching and compositing.
Free and open-source
Jira → OpenProject
GPL-3.0 self-hosted project management with Gantt, agile boards, and portfolio features in the free Community Edition.
Free to self-host (Community Edition, GPL-3.0); paid Enterprise cloud/on-premises tiers from about €5.95/user/month for premium and security add-ons
Postman → Bruno
A fast, git-native API client that stores collections as plain files.
Free and open-source core; optional Pro ($6/user/mo) and Ultimate ($11/user/mo) for advanced Git, SSO, and support
Proprietary Smart-Home Hubs → Home Assistant
Local-first home automation on hardware you own.
Free / open-source (runs on your own hardware)
ElevenLabs → Kokoro
82M parameters, Apache-2.0, and the top of the TTS leaderboard.
Free — weights are Apache-2.0. Costs are hardware only; a rented GPU capable of faster-than-real-time synthesis runs roughly $20–$80/month, and nothing at all if you already own a suitable card.
Google Photos → Immich
A self-hosted photo and video backup that feels like Google Photos.
Free and open-source (self-host); you provide the hardware and storage
Airtable → Baserow
MIT-core, self-hostable no-code database with the closest Airtable-style experience.
Free to self-host (MIT core); paid cloud and self-hosted premium/enterprise tiers available
Cursor → Cline
The open-source agent that lives in the editor you already have.
Free and open source (Apache-2.0) — you pay only your model provider. Optional prepaid Cline credits and a paid enterprise tier exist; bring-your-own-key needs no account.
Zoom → Jitsi Meet
Open-source video meetings with no account required.
Free / open-source (self-host or use a public instance)
Mailchimp → listmonk
Fast, self-hosted newsletter and mailing-list manager in a single binary.
Free / self-host (you pay only your server and SMTP-sending costs)
Google Analytics → Plausible
Lightweight, cookieless, privacy-first analytics.
Free self-host (Community Edition); paid cloud
Calendly → Easy!Appointments
Mature, self-hosted appointment booking with Google Calendar sync.
Free, self-hosted (own server/hosting cost only). Optional paid add-ons: SMS reminders, payment processing, custom development, and managed hosting from the maintainer.
Notion → Logseq
A local-first, open-source outliner over plain Markdown.
Free / open-source
Trello → Wekan
The closest open-source, self-hosted match to Trello's own card-and-list model.
Free / self-host (commercial support available separately)
Freshdesk → Zammad
A full-featured, AGPL-licensed help desk with ticketing, a knowledge base, and multi-channel inboxes.
Free to self-host with unlimited agents; optional managed cloud plans start around €19/agent/month and Zammad also sells paid support contracts for self-hosted installs.
Zendesk → Zammad
A full-featured, AGPL-licensed help desk with ticketing, a knowledge base, and multi-channel inboxes.
Free to self-host with unlimited agents; optional managed cloud plans start around €19/agent/month and Zammad also sells paid support contracts for self-hosted installs.
Adobe Acrobat Pro → Stirling PDF
A complete PDF toolbox on your own server — 50+ tools, MIT core.
Free (MIT core) — self-host via Docker; optional paid enterprise tiers
Auth0 → Keycloak
The mature, CNCF-backed open-source identity and access management server.
Free / self-host (Docker image or standalone distribution); commercial support available via Red Hat build of Keycloak (RHBK) for enterprises that want a support contract.
Evernote → Joplin
A free, open-source, Markdown-based note app with end-to-end encrypted sync and native Evernote import.
Core app is free forever with no note/device caps. Sync is free if you bring your own WebDAV/Nextcloud/S3/Dropbox target, or self-host Joplin Server for personal use at no cost; Joplin Cloud (managed hosted sync) starts around $2.99/month.
Slack → Mattermost
Self-hosted team chat built for security-conscious orgs.
Free self-host; paid Enterprise
1Password → Bitwarden
Open-source and free forever — the easy pick for most people.
Generous free tier; paid from about $1/month; self-host free
NordVPN → Mullvad VPN
The privacy gold standard — flat price, no account, fully audited.
Flat €5/month, no tiers; anonymous 16-digit account number, no email
Gmail → Proton Mail
End-to-end encrypted, open-source, Swiss — the privacy default.
Free (1GB); paid Mail Plus ~$4/mo; bundled Proton Unlimited adds Drive, VPN, and Pass
Zapier → n8n
Powerful, self-hostable workflow automation with a large node library.
Free to self-host; paid n8n Cloud tiers available
Incogni → EasyOptOuts
Near-top removal rates for $19.99 a year.
$19.99/yr flat — 240+ brokers, automated
Categories in this layer
Where this sits in the stack
L4 below · Models & tooling — The models themselves, plus the gateways, vector stores, frameworks and observability that make them usable.