Brave Search API
Brave Software, Inc. · Search & web-data APIs
Developer API over Brave's independent web index offering web, news, image, video, LLM-context and grounded-answer endpoints on prepaid credits
ProprietaryFreemiumUsage-basedNov 2, 2026
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Exa
Exa Labs · Search & web-data APIs
Search API for AI agents built on Exa's own web index, offering search, page contents, deep research and asynchronous agent endpoints with Python and JavaScript SDKs
ProprietaryFreemiumUsage-basedNov 2, 2026
LangSmith
LangChain, Inc. · Prompting, evaluation & observability
LangChain's hosted platform for tracing, evaluating and deploying LLM applications and agents, with prompt tooling, an LLM gateway and cloud, hybrid or self-hosted options
ProprietaryFreemiumPaidSelf-hostedNov 2, 2026
LlamaIndex
LlamaIndex, Inc. · Agent frameworks & orchestration
Open-source Python framework for retrieval-augmented agents over your data, with connectors, indexes, query engines and event-driven workflows, alongside the commercial LlamaParse document platform
MITOpen sourceFreeLocalSelf-hostedNov 2, 2026
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