Awesome GitHub RepositoriesBackward Compatibility Libraries

randomcompat is a backward-compatibility library that provides cryptographically secure random number generation functions for PHP 5.x environments. It delivers the randombytes() and random_int() functions that are natively available in PHP 7+, enabling legacy applications to generate secure random bytes and unbiased integers from system entropy sources. The library implements a priority-based fallback chain across operating-system CSPRNGs, selecting the best available random source in order of security. It uses rejection sampling to convert raw random bytes into unbiased integers withi

XXPermissions is a framework and manager for handling runtime and special system permissions across different Android operating system versions. It provides a unified interface for requesting standard permissions and directing users to system settings pages for advanced access control, such as file access and accessibility services. The project features a backward compatibility layer that abstracts version-specific logic, removing the need for manual operating system version checks in client code. It utilizes a chainable request pipeline to queue multiple permissions and manage their asynchro

AndroidX is the official collection of Android Jetpack libraries for building Android applications. It provides a suite of backward-compatible APIs that expose modern platform features on older Android versions, ensuring consistent functionality across devices. The project is built around lifecycle-aware component architecture, with tools like ViewModel for preserving UI data across configuration changes, LiveData for lifecycle-aware data observation, and WorkManager for constraint-based background task scheduling. The project distinguishes itself through compile-time code generation and type