xamarin/docs-archive

Flutter is Google's open-source SDK, hosted at flutter/flutter on GitHub, for building user interfaces across mobile, web, and desktop from a single Dart codebase. The repo is licensed BSD-3-Clause, and its README documents stateful hot reload, a Skia/Impeller rendering pipeline, and Material/Cupertino widget sets as the core pieces developers work with.

scrcpy is an open-source application from Genymobile that mirrors an Android device's video and audio onto a Linux, Windows, or macOS desktop over USB or TCP/IP, and lets you control the device using the computer's keyboard and mouse. It runs without root access and without installing any companion app on the phone, per the README, and the project is available under an Apache-2.0 license.

Free Programming Books (Chinese) is justjavac's GitHub index of free programming books, translated manuals, and course notes in Chinese, organized under headings like AI, Go, C/C++, and version control. It's a link list, not a curriculum - entries range from full book translations to single blog posts, some flagged `:worried:` for dead links, and contribution happens only through pull requests.

frp (fast reverse proxy) is a Go-based open source tool that creates secure tunnels from a public-facing server to localhost, enabling developers to expose services running on private networks or behind firewalls. With over 108k GitHub stars, it supports multiple protocols (TCP, UDP, HTTP, HTTPS), includes TLS encryption by default, and offers P2P connections for direct client-to-client communication. The architecture splits between frps (the server you deploy on a public VPS) and frpc (the client running on your LAN), with configuration via TOML, YAML, or JSON files. While v2 is in active development with ambitions toward cloud-native service mesh capabilities, the current stable version handles real-world NAT traversal and firewall bypass reliably for most use cases.