Apache Parquet
Apache Software Foundation · Data catalogs & formats
Open columnar file format for analytical data with compression, encodings and statistics, readable by nearly every data engine and library
Apache-2.0Open sourceFreeLocalNov 2, 2026
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Hugging Face Hub
Hugging Face · Training & fine-tuning
Hosting platform for open models, datasets and Spaces demo apps built on git repositories and Xet storage, with Inference Providers, Endpoints, Jobs and an open-source Python client and CLI
MixedFreemiumPaidLocalNov 2, 2026
Let's Encrypt
Internet Security Research Group (ISRG) · DNS & domains
Nonprofit certificate authority that issues free, automatically renewable TLS certificates through the ACME protocol
MPL-2.0FreeNov 2, 2026
Model Context Protocol
Model Context Protocol, a Series of LF Projects, LLC (originated by Anthropic) · Agent frameworks & orchestration
Open JSON-RPC standard for connecting AI applications to tools, data and prompts through servers, now stewarded under the Linux Foundation with SDKs in many languages
Open sourceOpen sourceFreeLocalSelf-hostedNov 2, 2026
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