Best AI Agent Tools

11x builds AI sales agents that prospect, email, call, and qualify leads around the clock. Alice handles outbound email sequences while Julian makes phone calls. At ~$5,000/month, it targets mid-market and enterprise teams replacing or augmenting human SDR headcount.

Key Features:

• •AI SDR (Alice) for automated prospecting and email outreach
• •AI Phone Agent (Julian) for voice conversations
• •24/7 multilingual operations

Browser-based platform for creating autonomous AI agents that break goals into tasks and execute them. Open-source with 34K+ GitHub stars, but development has slowed since 2023. Free tier available; Pro at $40/month.

Key Features:

• •Browser-based agent creation with no coding required
• •Goal-based task decomposition and execution
• •Real-time execution visualization

No-code platform for building AI agents with voice interactions, MCP integrations, and multi-model support. Deploy specialized agents for lead routing, document analysis, and business workflows. Free tier includes 1,000 agent calls.

Key Features:

• •No-code vibe coding agent builder
• •Voice interaction capabilities
• •MCP integrations for external data

Open-source RPC framework (Apache 2.0) that lets AI agents call functions across network boundaries without opening ports. Supports TypeScript, Go, and Python with long-polling SDKs for long-running agent tasks.

Key Features:

• •Universal RPC layer for cross-network function calling
• •No open ports required for function registration
• •Long-running function support via long polling