AGPL, self-hosted drop-in replacement for Microsoft Exchange: mail, calendar, and groupware with full Outlook and mobile compatibility, under EU jurisdiction. Free tier caps at 5 users.
Open Source Alternatives: The Sovereign Stack
A curated database of vetted open source alternatives to proprietary SaaS. Find tools that are safe, compliant, and ready for business.
Showing of 213 solutions
Turns your coding agent into a design engine that outputs prototypes, slides, and UI as local files. Bring your own model, cloud or fully local via Ollama. Early-stage.
Browser-based video editor that runs on-device: no uploads, no watermark, no account. A local-first alternative to ByteDance's CapCut. Still early-stage.
An Apache-2.0 cloud platform (IaaS): build a multi-tenant private cloud on your own hardware, across KVM, VMware, and Proxmox hypervisors. The vendor-neutral answer to VMware Cloud Director.
An offline, open-source Markdown editor for researchers, with Zettelkasten note-linking and citation management. It stores everything as plain .md files, a GPL-licensed alternative to Obsidian.
An offline-first, open-source note app with end-to-end encryption and plain-Markdown storage. A self-hosted alternative to Evernote; sync to your own WebDAV or Nextcloud, with team features paywalled.
The vendor-neutral CNCF standard for traces, metrics, and logs. Instrument once and route your telemetry to any backend, ending the agent lock-in that makes Datadog and New Relic so sticky.
A distraction-free desktop Markdown editor with live preview that works directly on local .md files, with no account, telemetry, or cloud. A fully offline, MIT-licensed alternative to Typora.
MIT-core LLM observability for tracing, evals, and prompt management. A self-hosted alternative to LangSmith, with enterprise compliance controls gated behind a paid license key.
Self-hosted assembly and voting platform for parliaments, parties and associations: agendas, motions, elections and live secret ballots. SAML SSO and every feature ship under MIT, no paid tiers.
A BSL-licensed platform unifying transactional and marketing email in one Postgres deployment, with a visual builder and built-in analytics. SSO, RBAC and audit logs sit behind a paid key.
An open-core localization platform, Apache-2.0 at the core, built around in-context editing and a developer SDK. SSO, granular RBAC and use beyond 10 seats need a paid Enterprise licence.
An AGPL-3.0, self-hosted translation-management platform: API-first, with broad localization-format support. A lighter, project-based alternative to Git-centric localization tools.
An MIT-licensed, in-process analytical SQL database: the SQLite for analytics. Embedded and zero-dependency, it queries Parquet, CSV and JSON in place, with no server to run.
The community fork that revived Maybe Finance under AGPLv3 after the startup shut down. All-in-one personal finance: budgeting, accounts, net worth. Fully open and self-hosted, no paid tier.
GPL-3.0 continuous-localization platform that syncs translations with your Git repos. SSO and RBAC are in the open build, so there is no feature paywall. EU-based, self-hosted.
The Linux Foundation fork of Redis after its 2024 relicense: a BSD-licensed in-memory datastore for caching and real-time workloads. Fully open source, but no official managed cloud.
BSL 1.1 in-memory datastore: a multi-threaded, drop-in Redis and Memcached replacement for vertical scaling. Source-available, not open source; reselling it as a hosted service is barred.
MIT-licensed platform that builds, versions and hosts docs-as-code from Git, with pull-request previews and search. Self-hosting sidesteps the paid hosted tiers but runs a heavy multi-service stack.
Real-time distributed OLAP datastore for user-facing analytics at high concurrency. Apache-governed. A heavy multi-node cluster; managed ops and anomaly detection are the commercial StarTree.
Real-time analytics database for sub-second queries on streaming and batch data, Apache-governed. A heavy distributed cluster to operate; managed ops and the Pivot BI console are the commercial Imply.
Real-time MPP OLAP database that queries open lakehouse tables directly. Apache-licensed, Linux Foundation-governed. A distributed cluster to run; masking and managed ops are the commercial cloud.
Real-time MPP data warehouse, MySQL-compatible and Apache-governed, built to leave cloud warehouses like Snowflake. A distributed cluster to run; SSO and managed ops sit with the commercial VeloDB.