Solseek is a simple terminal user interface that allows you to browse, search, and manage packages from the Solus packages. Packages can be installed, reinstalled, updated, verified, and removed through the interface.

Crates.io is described as 'Instantly publish your crates and install them. Use the API to interact and find out more information about available crates. Become a contributor and enhance the site with your work' and is a Package Manager in the development category. There are more than 50 alternatives to Crates.io for a variety of platforms, including Linux, Windows, Mac, Python and BSD apps. The best Crates.io alternative is Synaptic, which is both free and Open Source. Other great apps like Crates.io are Spyder, SciPy, npm and Anaconda.
Solseek is a simple terminal user interface that allows you to browse, search, and manage packages from the Solus packages. Packages can be installed, reinstalled, updated, verified, and removed through the interface.

Cargo is the Rust package manager. Cargo downloads your Rust package’s dependencies, compiles your packages, makes distributable packages, and uploads them to crates.io, the Rust community’s package registry.
Tvix is a new implementation of Nix, a purely-functional package manager. It aims to have a modular implementation, in which different components can be reused or replaced based on the use-case.