10 best Flagsmith alternatives

Filestash

Filestash is a self-hosted unified file management gateway that connects to dozens of storage backends such as S3, SFTP, WebDAV, and cloud drives through one web UI. The vendor sells Hobby and company licenses with SSO and enterprise features while keeping a free self-hosted AGPL tier for small teams.

• From $6/mo
• Free plan
• API available

Best for: Teams that need one browser interface across many storage providers with optional commercial support.

Firezone

Firezone provides zero-trust network access with native clients, identity integrations, and policy controls for teams scaling secure connectivity. Starter covers homelab use, Team adds per-seat monthly billing, and Business layers directory sync, posture checks, and broader feature access.

• From $5/mo
• Free plan
• API available

NodeBB

NodeBB is modern forum software offered as managed cloud hosting with tiered pageview limits or as self-hosted open source. Paid cloud plans add SSL, custom domains, plugin support, backups, and priority support for communities from hobby groups to large organizations.

• From $20/mo
• Free tier unknown
• API unknown

Best for: Community managers who want a hosted NodeBB forum without operating their own infrastructure.

EspoCRM

EspoCRM is an open-source customer relationship platform for managing contacts, sales pipelines, support cases, and marketing activity in one place. The vendor offers a self-hosted edition you can customize with workflows, automation, and extensions, plus a managed EspoCRM Cloud service with US or EU hosting.

ClearFlask

ClearFlask is an open-source customer feedback platform for collecting ideas, prioritizing roadmaps, and publishing announcements. Teams can run the Apache-licensed stack self-hosted or use ClearFlask Cloud, with AI-assisted feedback analysis on the marketing site.

Strapi

Strapi is an open-source TypeScript headless CMS and content framework. Teams model content types, get auto-generated REST and GraphQL APIs, customize the admin and backend, and can self-host or deploy to Strapi Cloud.

Documenso

Documenso is an open-source electronic signature platform positioned as a DocuSign alternative. Users sign documents, build templates and workflows, and integrate signing into other tools via hosted or self-hosted deployments.

• From $25/mo
• Free plan
• API available

Best for: Individuals and teams needing modern e-signatures with open-source deployment options.

Activepieces

Activepieces is an open automation platform for building AI agents, flows, tables, and MCP integrations with a visual builder and cloud or self-hosted deployment. Teams use it to connect apps, run chat-to-automation workflows, and embed white-label automation in their products.

• From $20/mo
• Free plan
• API available

Best for: Builders and ops teams automating internal workflows, plus product teams embedding automation under their own brand.

Ever Gauzy

Ever Gauzy is an open business management platform combining ERP, CRM, HRM, and project management modules. Teams can choose self-hosted editions or Gauzy Cloud subscriptions, with public-roadmap messaging that some modules may still be incomplete while the platform evolves.

• From $17/mo
• Free plan
• API unknown

Best for: Growing companies that want an open-source operations hub covering HR, CRM, projects, and accounting in one stack.

coveralls.io

Coveralls tracks test coverage history and statistics for software repositories, highlighting untested code so teams can ship with more confidence. It integrates with GitHub, Bitbucket, and GitLab, stays free for open-source repos, and sells paid cloud plans for private repositories and enterprise hosting.

• From $10/mo
• Free plan
• API unknown

Best for: Engineering teams that want continuous coverage reporting on private repos or free coverage tracking for open-source projects.