Alternatives to Tessl

Simulation-based AI agent testing that catches hallucinations before production

Marketplace for ready-made AI agent skills you can run, publish, and monetize.

React frontend stack for building agentic user experiences with generative UI

Agentic AI for the entire DevSecOps lifecycle in GitLab.

Open-source agentic AI data assistant for SQL, code, and reports

Open-weight agentic coding models for secure on-prem enterprise AI

China's leading open-source LLM platform with agentic autonomy and full-stack MaaS APIs.

AI-native agentic application security that blocks malicious code and reaches real vulnerabilities.

Open-source multi-agent framework for role-based software engineering

Open-source Python SDK for building multi-agent workflows with handoffs, guardrails, and sandboxing

Open AI toolkit for loyal, auditable coding agents.

Microsoft's framework for building production-grade agentic AI on Azure, with Python, C#, and Go SDKs and a GA Agent Harness runtime.

Durable execution for workflows & AI agents — no queues or infrastructure

Open-source framework for building multi-agent AI workflows.

Open-source TypeScript framework for building durable, observable AI agents and workflows.

Developer-first platform to connect APIs, AI, and databases via workflows and agents.

Hugging Face's barebones Python library for AI agents that act by writing code.

Secure and govern AI-generated code from prompt to runtime with agentic development security.

Governed no-code backend for building APIs and AI agents with natural language

Visual AI agent canvas for infinite-context multimodal creation

Microsoft's open-source SDK for building production-grade AI agents with plugins, memory, and orchestration.

Microsoft's open-source, code-first agent framework for stateful, data-intensive conversational tasks.

Pydantic AI: Python SDK for typed, production-grade AI agents with every model a string swap away.

Open-source desktop AI agent with autonomous learning loop and deep memory

Open-source AI agent with smart routing that cuts token costs 60-80%.

Self-hosted cloud dev environments with AI governance and agent control for enterprises

Run any AI coding agent from anywhere — self-hosted, multi-provider, open source.

Open-source LLM that turns natural language into API calls for tool-using agents

Open-source AI agent that automates 20+ messaging platforms with persistent memory.

Open-source, self-hosted AI agent that plans tasks, runs tools, and evolves memory across 10+ channels.