There are 3 repositories under discreet-log-contract topic.
Demo RGB20 Contract DEX based on RGB v0.11.0-beta.6 (Core basic functionality) for Bitswap via CLI
Javascript library for working with Discreet Log Contracts and Lightning Network
Ticketed Discreet Log Contracts (DLCs) to enable instant buy-in for wager-like contracts on Bitcoin.
Core functionality for Portico Exchange
Simple Proof of Concept on Lightning lending
BITP (Bitswap Improvement Proposal) and specs
PIP (Portico Improvement Proposal) and specs
Basic documentation for Bitswap