AgentScout / By role / Startup CTOs

AI agents for startup CTOs (2026)

Coding agents, agent infrastructure, monitoring and security tools for CTOs deciding what their small team builds and buys. We picked the top tools for 5 jobs startup CTOs do every day: 30 tools in all, 27 of them free or with a free tier.

Jump to: Run several coding agents at once · Build agents · Deploy and host agents · Monitor in production · Agent security

Free tools from AgentScout for startup CTOs: AI API cost calculator · Agent setup generator

How we picked: each section takes the tools matched to that task in our directory, putting tools whose category and stated use cases fit the task first, then ordering by tracked GitHub stars. No paid placements.

Run several coding agents at once

Command centers, IDEs and CLIs for running several coding agents at once, each on its own task or Git worktree, then reviewing what they hand back. All 9 tools →

Orca Open source
Agent development environment for running a fleet of parallel coding agents on your own subscriptions and reviewing their work. · ★ 94,443
Herdr Open source
Runtime for running and managing many coding agents side by side. · ★ 44,377
Paseo Open source
Orchestrate multiple coding agents from desktop and mobile. · ★ 21,143
Superset Source-available
Agentic IDE for orchestrating many coding agents in parallel. · ★ 15,289
Worktrunk Open source
CLI for managing Git worktrees so several AI agents can work in parallel. · ★ 9,263
Mission Control Open source
Self-hosted control plane for dispatching tasks to agents, reviewing runs and tracking spend. · ★ 6,358

Build agents

Frameworks and SDKs for developers building their own agents, with tools, state and orchestration built in. All 204 tools →

Hermes Agent (Nous Research) Open source
Open-source agent harness; v0.21.7 stable shipped Oct 12, v0.22.0 RCs Oct 13-14. · ★ 253,590
DeepSeek Harness Open source
DeepSeek's open-source agent harness with a local web UI, built so that every tool, model and scheduled task is a swappable plugin; still a developer preview. · ★ 251,853
AutoGPT Source-available + cloud
One of the first autonomous agent projects, now a platform for building, deploying and running continuous AI agents that automate workflows. · ★ 187,612
RAGFlow Open source + cloud
Open-source RAG engine with deep document parsing and agent features for building grounded question-answering over your files. · ★ 92,335
Ruflo Open source
Open-source multi-agent meta-harness for Claude Code, Codex, and MCP clients; Oct 13 release adds Mods (mission workflows) and a single control plane with human approval. · ★ 74,609
MetaGPT Open source
Multi-agent framework that assigns roles like product manager and engineer to LLM agents to build software. · ★ 70,885

Deploy and host agents

Infrastructure for running agents in production: hosting, scaling and serverless runtimes. All 22 tools →

Sim Studio Open source + cloud
Workspace for visually building, deploying and monitoring AI agents and workflows. · ★ 29,835
Google ADK Open source
Google's Agent Development Kit for building and deploying agents. · ★ 21,826
RocketRide Open source
AI pipeline engine with a C++ core and 50+ Python nodes for building, debugging and deploying LLM workflows and agents from VS Code or the CLI. · ★ 17,753
Trigger.dev Open source + cloud
Platform for building and deploying durable background AI agents and workflows in TypeScript. · ★ 16,558
VoltAgent Open source + cloud
TypeScript agent framework plus an engineering platform for building, observing and deploying AI agents. · ★ 10,819
Nasiko Open source
Open runtime for deploying and operating AI agents. · ★ 9,479

Monitor in production

Observability for agents in production: traces, costs, latency and errors in one place. All 29 tools →

MLflow Open source + cloud
Open-source platform for tracing, evaluating and managing agents, LLM apps and ML models. · ★ 28,418
Opik Open source + cloud
Comet's open-source platform for tracing, evaluating and monitoring LLM apps, RAG systems and agent workflows, self-hosted or in the cloud. · ★ 22,700
Arize Phoenix Source-available
Open-source tracing and evaluation for LLM apps. · ★ 11,828
Failproof AI Open source
Observability and policy enforcement for AI agent harnesses. · ★ 5,560
agentgateway Open source
Proxy for AI agents and MCP servers with security and observability. · ★ 5,373
Agenta Open source + cloud
Open-source LLMOps platform for prompt management, evaluation and observability. · ★ 4,840

Agent security

Guardrails, policies and monitoring that keep agents from doing what they shouldn't. All 53 tools →

Strix Open source + cloud
Open-source AI agents that run penetration tests on your app to find and help fix security vulnerabilities. · ★ 69,022
LiteLLM Open source + cloud
Open-source AI gateway and Python SDK that calls 100+ LLM providers in the OpenAI format, with cost tracking, guardrails, load balancing and logging. · ★ 61,465
Kong Gateway Open source + cloud
Cloud-native API, LLM and MCP gateway that adds routing, auth, multi-LLM support, semantic security and MCP traffic analytics through plugins. · ★ 44,278
OpenSandbox Open source
Secure, fast sandbox runtime for AI agents to run code. · ★ 15,907
Instructor Open source
Library for getting validated structured outputs from any LLM, built on Pydantic with retries and type safety. · ★ 14,029
Portkey AI Gateway Open source + cloud
Fast open-source AI gateway that routes requests to hundreds of LLMs through one API with fallbacks, load balancing and built-in guardrails. · ★ 13,214