Open source focus

Open Source Alternatives to Mailhaven

8 open source AI Coding Assistant options similar to Mailhaven, ranked by named competitors first, sector overlap, and our 0-100 AI-readiness score. Every company listed publishes its source: each one carries an open source sector tag and a public GitHub repository.

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All-Hands AI
Not rated
An open-source platform for building and running AI coding agents that automate software development tasks.
Open source · Self-hostable
Kilo Code
Not rated
Open-source, agentic AI coding tool for VS Code, combining Cline and Roo Code features.
Open source · Self-hostable
OpenDevin
Not rated
An open-source platform for developing AI-powered autonomous software engineering agents.
Open source · Self-hostable
z.ai
Not rated
Developing advanced AI models with a focus on reducing hallucinations, including large language models, vision language models, and text-to-video models.
Open source
DeepSeek
Not rated
DeepSeek is a Chinese AI company developing open-weight large language models and an AI assistant, aiming to achieve Artificial General Intelligence.
Open source
Probabl
Not rated
Track experiments, validate models, and collaborate with confidence using Skore, the methodology layer for AI coding tools.
Open source
Slauth.io
Not rated
Ark Infotech offers Cybersecurity, AI/ML, Data Analytics, and IT consulting services, including the Slauth.io IAM Policy Copilot.
Open source · Self-hostable
OP
OpenWorker
Not rated
OpenWorker is an open-source desktop AI agent that runs locally, integrates with everyday tools, and delivers finished outcomes by breaking down tasks.
Open source

Company	License	Founded	Rating	Reviews
All-Hands AIAn open-source platform for building and running AI coding agents that automate software development tasks.	Open source · Self-hostable	-	Not rated	-
Kilo CodeOpen-source, agentic AI coding tool for VS Code, combining Cline and Roo Code features.	Open source · Self-hostable	-	Not rated	-
OpenDevinAn open-source platform for developing AI-powered autonomous software engineering agents.	Open source · Self-hostable	-	Not rated	-
z.aiDeveloping advanced AI models with a focus on reducing hallucinations, including large language models, vision language models, and text-to-video models.	Open source	-	Not rated	-
DeepSeekDeepSeek is a Chinese AI company developing open-weight large language models and an AI assistant, aiming to achieve Artificial General Intelligence.	Open source	-	Not rated	-
ProbablTrack experiments, validate models, and collaborate with confidence using Skore, the methodology layer for AI coding tools.	Open source	-	Not rated	-
Slauth.ioArk Infotech offers Cybersecurity, AI/ML, Data Analytics, and IT consulting services, including the Slauth.io IAM Policy Copilot.	Open source · Self-hostable	-	Not rated	-
OPOpenWorkerOpenWorker is an open-source desktop AI agent that runs locally, integrates with everyday tools, and delivers finished outcomes by breaking down tasks.	Open source	-	Not rated	-