GitHub Daily Trending Projects - January 21, 2026

microsoft /

agent-lightning

#5

The absolute trainer to light up AI agents.

twitter /

the-algorithm

#3

Source code for the X Recommendation Algorithm

tambo-ai /

tambo

#1

Generative UI SDK for React

EveryInc /

compound-engineering-plugin

#2

Official Claude Code compound engineering plugin

tobi /

try

#8

fresh directories for every vibe

xai-org /

grok-1

#4

Grok open release

VectifyAI /

PageIndex

#6

📑 PageIndex: Document Index for Vectorless, Reasoning-based RAG

microsoft /

Data-Science-For-Beginners

#7

10 Weeks, 20 Lessons, Data Science for All!