Open source. Open possibilities.

GSYVideoPlayer is a multi-functional Android video player supporting IJKPlayer, Media3 (ExoPlayer), MediaPlayer, and AliPlayer kernels with extensive playback, caching, and customization features.

testssl.sh is a free, open-source command-line tool that scans servers for TLS/SSL cipher, protocol, and cryptographic flaw support on any port. It requires no installation, works across Linux, macOS, BSD, and Windows environments, and outputs results in human-readable, CSV, JSON, or HTML formats.

acme.sh is a pure Unix shell ACME protocol client that automates issuing, renewing and installing SSL/TLS certificates from CAs like ZeroSSL and Let's Encrypt, with no Python dependency and support for many DNS APIs and web servers.

Certimate is a free, open-source self-hosted ACME tool that automates the full SSL certificate lifecycle—issuance, deployment, renewal, and monitoring—through a visual workflow, with support for 70+ DNS providers and 160+ deployment destinations.

Echo is a high-performance, extensible and minimalist Go web framework built on Go's standard net/http, offering a radix-tree router, request binding, grouping, a middleware ecosystem, centralized error handling, HTTP/2 and automatic TLS.

An interactive, TLS-capable intercepting HTTP proxy designed for penetration testers and software developers to analyze network traffic.