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Day 43 since launch: Best Productivity Resources went live on 25 August 2026. Day 43 is live with yesterday's additions in the latest roundup!

Framework

Agentsmith

Universal, model-agnostic operating harness for AI agents like Claude, Codex and Gemini.

Built with love by Shushant Lakhyani. Building bestproductivityresources.com

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What is Agentsmith?

Agentsmith is a universal, model-agnostic operating harness for AI agents. A lean core plus work-type profiles are assembled by a single setup script, so the same harness works across Claude, Codex, Gemini and other agents.

Pros

  • Works across Claude, Codex, Gemini and other agents
  • Lean core with work-type profiles
  • Assembled by a single setup script

Cons

  • Requires command-line comfort
  • Best suited to people already using AI agents

Who should use Agentsmith

Developers who run multiple AI agents and want one consistent operating harness for all of them.

Who may not need it

People who only use a single AI chat app with no agent workflows.

Agentsmith alternatives

Similar resources to Agentsmith, picked from the directory.

Harness Mix

A local kernel that connects many coding harnesses into one Codex Desktop native UI.

Desktop AppAI ProductivitymacOS, WindowsFree

Ego Lite

The fastest browser for AI agents to run browser automation without disturbing you.

WebsiteAI ProductivityWeb, macOSFree

Open Run

Schedule Claude Code, Codex, Grok and Gemini like cron jobs on your machine.

Web AppAutomationWeb, Cross-PlatformFree

Free alternatives to Agentsmith

Free resources that cover similar ground.

Mosoo

An open-source Agent Gallery and Gateway for Codex, Claude Agent SDK and OpenCode.

AI ToolAI ProductivityWebFree

Gentle Shell

Turn Pi into a senior-architect development harness with SDD, subagents and strict TDD evidence.

AI ToolAI ProductivitymacOS, LinuxFree

Opendray

Self-hosted gateway for running AI coding agents on your own infrastructure.

AI ToolAI ProductivityWeb, Cross-PlatformFree

Gold Band

A desktop app for harness engineering, loop engineering and graph engineering in local AI-agent workflows.

Desktop AppAI ProductivitymacOS, WindowsFree

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