#free

"build-your-own-x" is an open-source repository curated by CodeCrafters.io, compiling a wealth of high-quality, step-by-step guides. It teaches how to build diverse core technologies from scratch, such as 3D renderers, AI models, blockchains, and databases. By focusing on practical implementation, it helps developers deeply understand the underlying principles of complex systems, supporting multiple programming languages.

The Public APIs repository is a manually curated list of public APIs maintained by community members and APILayer. It encompasses an extensive collection of public API interfaces from various domains, serving as a well-managed treasure trove for developers to discover and utilize in their products. Its primary function is to provide an aggregated resource for API discovery.