Open Source Libraries
Discover 309 open source Library repositories from GitHub, each with an analysis of what it does, key features, use cases and alternatives. Library projects here are most often combined with Python, Developer Tools and TypeScript. Last updated October 4, 2026.
309 repositories · updated October 4, 2026
xgrammar: Constrain Language Model Output to Structured Formats
XGrammar is a library for constrained decoding that helps language models produce outputs matching JSON, regular expressions, or context-free grammars. It suits teams integrating structured output into LLM inference and applications that need reliable machine-readable responses.
jsonformer: Generate Schema-Conforming JSON with Language Models
Jsonformer guides Hugging Face language models to produce JSON that matches a supplied schema by generating variable content while inserting predictable structure itself. It suits developers who need structured model output and can work within its supported JSON Schema subset.
llm-guard: Add Security Checks to LLM Interactions
LLM Guard is a Python toolkit for screening prompts and model outputs for risks such as prompt injection, harmful content, and sensitive data. It is archived, so consider it for existing integrations or evaluation, not as a maintained security layer.
AuditNLG: Check and Improve Trust in Generated Text
AuditNLG is a Python library for evaluating generated text for factualness, safety, and instruction compliance. It combines model- and API-based checks with explanations and rewrite suggestions for research and language-model application teams.
spacy-llm: Add LLM Tasks to spaCy NLP Pipelines
spacy-llm connects large language models to spaCy pipelines, turning model responses into structured NLP outputs without training data. It suits teams prototyping NLP tasks or combining LLM components with conventional spaCy processing.
orbitdb: Build Peer-to-Peer Databases
OrbitDB is a JavaScript database for decentralized and local-first applications. It stores data with IPFS and synchronizes peers using Libp2p Pubsub, with Merkle-CRDTs to merge concurrent writes.
vue-pdf-embed: Display PDF Documents in Vue Apps
A Vue component for rendering PDF documents inside web applications, with optional text and annotation layers, search, and document controls. It suits Vue teams that need an integrated viewer rather than a separate PDF page or browser plugin.
QuestPDF: Generate PDF Documents with C#
QuestPDF is a C# library for creating structured PDF documents through a fluent, component-based API. It suits .NET developers building reports, invoices, and other data-driven documents without relying on HTML-to-PDF conversion.
ipspot: Find IP Addresses and Geolocation
IPSpot is a Python library and CLI for detecting public and private IPv4 and IPv6 addresses, with optional geolocation details. It queries multiple providers and supports automatic provider selection and fallback.
vamp: Accelerate Robot Motion Planning with SIMD
VAMP is a C++ motion-planning library that uses CPU SIMD instructions to speed up collision checking and forward kinematics. It offers several sampling-based planners and Python bindings for robotics research and applications.
tidesdb: Build Transactional Key-Value Storage into C Applications
TidesDB is an embeddable C storage engine for applications that need transactional key-value or column-family storage without adopting a full database server. Its LSM-based design combines configurable durability, range scans, and multiple transaction isolation levels.
ascii-chat: Video Chat in Your Terminal
ascii-chat turns webcam video into colored terminal art for live, multi-person calls over a client-server network. It also supports audio, encryption, and media from files or URLs, but setup involves a substantial native dependency stack.