Suggest: Airport Tools (free online toolset for proxy users)

[yezuofan-code]

Suggestion: add 机场工具箱 (Airport Tools) - free online toolset for proxy users

https://tools.huanghaiwan.com

Includes: subscription converter, node checker, rule/proxy generator, coupon aggregator, speed test, WebRTC leak test, IP info, config converter. All free, no registration required.