# Agents > An index and topic collection covering AI agents, agent frameworks, and agent runtimes that enable autonomous reasoning, tool use, and multi-step task execution. This profile catalogs the platforms and open-source projects that let developers build, orchestrate, and deploy LLM-powered agents, inc... This is the **Agents** topic area of [API Evangelist](https://apievangelist.com) — a network of focused knowledge bases drawn from 16 years of independent API research by Kin Lane. Browse all areas at https://apievangelist.com/areas/. ## Services & Tools - [Agentic AI Foundation](https://providers.apis.io/providers/agentic-ai-foundation/) (repo: https://github.com/api-evangelist/agentic-ai-foundation) - [AgentGateway](https://providers.apis.io/providers/agentgateway/) (repo: https://github.com/api-evangelist/agentgateway) - [AgentQL](https://providers.apis.io/providers/agentql/) (repo: https://github.com/api-evangelist/agentql) - [Amazon Bedrock](https://providers.apis.io/providers/amazon-bedrock/) (repo: https://github.com/api-evangelist/amazon-bedrock) - [Anthropic](https://providers.apis.io/providers/anthropic/) (repo: https://github.com/api-evangelist/anthropic) - [AutoGen](https://providers.apis.io/providers/autogen/) (repo: https://github.com/api-evangelist/autogen) - [AutoGPT](https://providers.apis.io/providers/autogpt/) (repo: https://github.com/api-evangelist/autogpt) - [Bifrost](https://providers.apis.io/providers/bifrost/) (repo: https://github.com/api-evangelist/bifrost) - [Composio](https://providers.apis.io/providers/composio/) (repo: https://github.com/api-evangelist/composio) - [CrewAI](https://providers.apis.io/providers/crewai/) (repo: https://github.com/api-evangelist/crewai) - [Google ADK](https://providers.apis.io/providers/google-adk/) (repo: https://github.com/api-evangelist/google-adk) - [Google Vertex AI](https://providers.apis.io/providers/google-vertex-ai/) (repo: https://github.com/api-evangelist/google-vertex-ai) - [Haystack](https://providers.apis.io/providers/haystack/) (repo: https://github.com/api-evangelist/haystack) - [Jentic](https://providers.apis.io/providers/jentic/) (repo: https://github.com/api-evangelist/jentic) - [kagent](https://providers.apis.io/providers/kagent/) (repo: https://github.com/api-evangelist/kagent) - [LangChain](https://providers.apis.io/providers/langchain/) (repo: https://github.com/api-evangelist/langchain) - [LangGraph](https://providers.apis.io/providers/langgraph/) (repo: https://github.com/api-evangelist/langgraph) - [Letta](https://providers.apis.io/providers/letta/) (repo: https://github.com/api-evangelist/letta) - [Lindy](https://providers.apis.io/providers/lindy/) (repo: https://github.com/api-evangelist/lindy) - [LiveKit](https://providers.apis.io/providers/livekit/) (repo: https://github.com/api-evangelist/livekit) - [LlamaIndex](https://providers.apis.io/providers/llamaindex/) (repo: https://github.com/api-evangelist/llamaindex) - [Microsoft Azure AI Foundry](https://providers.apis.io/providers/azure-ai-foundry/) (repo: https://github.com/api-evangelist/azure-ai-foundry) - [Microsoft Power Virtual Agents](https://providers.apis.io/providers/microsoft-power-virtual-agents/) (repo: https://github.com/api-evangelist/microsoft-power-virtual-agents) - [OpenAI](https://providers.apis.io/providers/openai/) (repo: https://github.com/api-evangelist/openai) - [Portkey](https://providers.apis.io/providers/portkey/) (repo: https://github.com/api-evangelist/portkey) - [Relevance AI](https://providers.apis.io/providers/relevance-ai/) (repo: https://github.com/api-evangelist/relevance-ai) - [Restack](https://providers.apis.io/providers/restack/) (repo: https://github.com/api-evangelist/restack) - [Stackmint](https://providers.apis.io/providers/stackmint/) (repo: https://github.com/api-evangelist/stackmint) - [SuperAgent](https://providers.apis.io/providers/superagent/) (repo: https://github.com/api-evangelist/superagent) - [Toolhouse](https://providers.apis.io/providers/toolhouse/) (repo: https://github.com/api-evangelist/toolhouse) - [Trigger.dev](https://providers.apis.io/providers/trigger-dev/) (repo: https://github.com/api-evangelist/trigger-dev) - [TrueFoundry](https://providers.apis.io/providers/truefoundry/) (repo: https://github.com/api-evangelist/truefoundry) ## Common Features - **Planning and Reasoning Loops**: Agent frameworks like LangGraph, AutoGen, and CrewAI provide structured loops for planning, reflection, and multi-step reasoning over user goals, breaking complex tasks into ordered sub-tasks. - **Tool Calling and Function Use**: Agents invoke external functions, APIs, and aggregated tool catalogs through provider-native tool calling, expanding their reach beyond text generation into real-world action. - **Memory and State Management**: Frameworks like Letta and LangGraph provide persistent memory, conversation state, and long-running execution context so agents can resume work, remember users, and accumulate knowledge over time. - **Multi-Agent Orchestration**: CrewAI, AutoGen, and LangGraph enable multiple specialized agents to collaborate, delegate sub-tasks, and reach consensus, modeling teams of role-based workers around a shared goal. - **Provider-Native Agent Runtimes**: OpenAI Assistants, Anthropic Claude tool use, Google ADK, Amazon Bedrock Agents, and Microsoft Azure AI Foundry expose first-party agent runtimes that handle planning, tool invocation, and state on the model provider side. - **Browser and Web Agents**: Agents like AgentQL and browser-driving frameworks let LLMs navigate real web pages, fill forms, and extract structured data, extending agent reach to systems that lack APIs. - **Observability and Evaluation**: Platforms like Portkey, TrueFoundry, and Bifrost provide tracing, evaluation, cost tracking, and gateway routing across agent runs to make agent behavior observable and debuggable. - **Open Governance and Interoperability**: The Linux Foundation Agentic AI Foundation and projects like kagent and AgentGateway are establishing open standards for agent-to-agent communication, identity, and runtime portability. ## Use Cases - **Customer Support Automation**: Hosted agent platforms like Lindy, Relevance AI, and Microsoft Power Virtual Agents handle inbound support tickets, route conversations, and resolve common requests end-to-end. - **Research and Knowledge Work**: LangChain and LlamaIndex agents combine retrieval over enterprise documents with reasoning to answer complex questions and synthesize multi-source briefings. - **Sales and Outbound Workflows**: Agents built on Lindy, Relevance AI, and Composio prospect leads, draft outreach, log CRM activity, and orchestrate multi-step sales sequences. - **Software Engineering Agents**: AutoGPT, AutoGen, and CrewAI-based engineering agents read repositories, draft pull requests, run tests, and iterate on code under human review. - **Voice and Telephony Agents**: LiveKit and similar runtimes power real-time voice agents that handle phone calls, meetings, and live conversations using streaming LLMs and tool calling. - **Internal Operations and IT Automation**: Agentic platforms like Restack, Trigger.dev, and Stackmint orchestrate long-running internal workflows across SaaS, databases, and identity systems. - **Multi-Agent Team Simulations**: CrewAI and AutoGen model role-based teams (researcher, writer, reviewer) collaborating on a single deliverable, producing higher-quality output than a single agent. ## Related Areas - [Agent Skills](https://agents-skills.apievangelist.com): An index and topic collection covering Agent Skills, the packaged, file-based capability units that AI coding agents ... - [AI Automation](https://ai-automation.apievangelist.com): AI automation combines artificial intelligence with workflow and process automation to create intelligent, autonomous... - [Containers](https://containers.apievangelist.com): An index of container runtime, orchestration, registry, security, and build tool repositories tracking the services a... - [iPaaS](https://ipaas.apievangelist.com): This is the index of iPaaS (integration platform as a service) repos being tracked by the API Evangelist network. - [AIOps](https://aiops.apievangelist.com): AIOps applies artificial intelligence and machine learning to IT operations, enabling intelligent alerting, anomaly d... - [Orchestration](https://orchestration.apievangelist.com): An index and topic collection covering container orchestration and workflow orchestration platforms. Container orches... ## More - [Latest Agents stories](/stories/) - [All API Evangelist topic areas](https://apievangelist.com/areas/) - [API Evangelist network index (llms.txt)](https://apievangelist.com/llms.txt)