Top Alternatives to OnionCat

Tor (The Onion Router) is a free and open-source software that enables anonymous communication. It directs internet traffic through a free, worldwide volunteer overlay network, consisting of thousands of relays, to conceal a user's location and usage from anyone conducting network surveillance or traffic analysis.

Tor Browser is a modified version of Firefox designed for anonymous web browsing. It routes your internet traffic through the Tor network, making it significantly harder to track your online activity and location. Ideal for users who prioritize privacy and wish to bypass censorship.

I2P (The Invisible Internet Project) is a secure, anonymous overlay network layer designed for privacy-preserving communication and application hosting. It enables users to browse anonymously, host websites (.i2p 'eepsites'), chat, and transfer files without revealing their identity or location.

Freenet is a robust, decentralized peer-to-peer platform designed to provide uncensored communication and information sharing. It leverages a distributed data store and a suite of free software applications to enable users to publish and access content anonymously, bypassing censorship and surveillance.

GNUnet is a free and open-source framework for building secure, distributed, and privacy-preserving peer-to-peer applications. It goes beyond simple file sharing, offering a foundation for various decentralized services designed to resist surveillance and censorship.

Lantern is a free software application designed to bypass internet censorship and provide access to blocked websites and content.

Cjdns is a peer-to-peer encrypted network protocol designed for easy setup, smooth scalability, and ubiquitous security. It aims to build a decentralized, distributed, and secure internet alternative.