Btunnel gives you power to expose an http app running in localhost, helps you to share your local filesystem as well as any TCP app to the internet. Some of the features of btunnel are -
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Rathole Alternatives
Rathole is described as 'A lightweight, stable and high-performance reverse proxy for NAT traversal, written in Rust. An alternative to frp and ngrok. With lower resource consumption, it's possible to run on embedded devices like routers' and is an app in the network & admin category. There are more than 25 alternatives to Rathole for a variety of platforms, including Linux, Windows, Mac, Self-Hosted and Android apps. The best Rathole alternative is OpenVPN Connect, which is both free and Open Source. Other great apps like Rathole are WireGuard, Fossorial Pangolin, WG Tunnel and ngrok.