10 best Twenty alternatives

Executor

Executor is an open-source gateway that connects AI agents to the SaaS tools a team already uses, with cloud hosting and optional self-hosted enterprise deployment. It emphasizes safe tool execution, verified domains, and a single integration surface for agent workflows.

• From $15/mo
• Free plan
• API available

Best for: Engineering teams wiring multiple AI agents into CRMs, dev tools, and internal SaaS without rebuilding each integration per agent.

Novu

Novu is open-source notification infrastructure for connecting AI agents and products to customers across in-app, email, SMS, push, WhatsApp, Slack, Teams, and Telegram channels. Cloud plans meter workflow runs while enterprise options add compliance, residency, and self-hosted deployment.

Revdoku

Revdoku gives AI agents dedicated email inboxes with cloud storage, attachment handling, and REST, CLI, or MCP access. Teams provision mailboxes, connect AI workflows, and manage files generated by agents or APIs under EU hosting options.

• From $9.99/mo
• Free plan
• API available

Best for: Developers building AI agents that need real email addresses and file storage integrations.

Authgear

Authgear is an open-source customer and workforce identity platform from Skymakers. It delivers passkeys, passwordless OTP, SAML SSO, adaptive MFA, RBAC, and user management on Authgear Cloud, customer VPC, or self-hosted deployments with data sovereignty options.

• From $50/mo
• Free plan
• API available

Best for: Teams replacing legacy CIAM vendors who need every login method on every tier and portable user exports.

Medplum

Medplum is an open-source healthcare developer platform for building and running modern clinical apps on FHIR-native infrastructure. It offers hosted cloud tiers and self-hosted options with bots, integrations, authentication, and compliance features aimed at digital health teams shipping production patient-facing software.

Brainbase Labs

Brainbase Labs hosts internal AI agents that self-improve through evaluations, observability, and hillclimbing. The platform offers managed agent APIs, orchestration across models and harnesses, sandboxes, auth, and deployment options from managed cloud to private cloud and on-premise.

• From $500/mo
• Free plan
• API available

Best for: Teams shipping production agents who want managed hosting, evals, orchestration, and enterprise deployment options.

Langfuse

Langfuse is an open-source LLM engineering platform for tracing, evaluating, and improving AI agents with collaborative debugging and metrics. Langfuse Cloud offers hosted Hobby, Core, and Pro tiers metered in observability units.

• From $29/mo
• Free plan
• API available

Best for: AI engineers who need open-source-friendly observability and eval workflows without building tooling in-house.

Mem0

Mem0 provides persistent memory infrastructure for AI agents and applications so context survives across sessions, users, and agents. The platform offers hosted plans with SDK integration plus open-source options for developers building production agents that need durable recall.

• From $19/mo
• Free plan
• API available

Pritunl

Pritunl is an open-source enterprise VPN platform for OpenVPN, WireGuard, and IPsec with a web management UI, multi-host clustering over MongoDB, and optional premium features such as SSO and site-to-site links. It targets self-hosted remote access and VPC peering across clouds.

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

Best for: Infrastructure teams needing self-hosted VPN with horizontal scaling and enterprise authentication options.