In the great tradition of tooting one's own horn, I'd like to suggest mutagen, a mutation testing framework for Rust. There has been some work since the last release and the next one is around the corner...
Nannou - An open-source creative-coding framework for Rust.
Oxy - A security focused remote access tool written in Rust. (alternative to SSH).
C2Rust - C to Rust translation, refactoring, and cross-checking.
cargo-geiger - Detects usage of unsafe Rust in your project and its dependencies.
I'd like to nominate datafrog by Frank McSherry
In the words of @nikomatsakis on his blogpost MIR-based borrow check (NLL) status update:
[the] analysis is now easily as fast as the existing Nightly analysis, thanks some smarter encoding of the rules as well as the move to use datafrog.
(emphasis mine)
Anything that helps the borrowchecker iterate faster towards NLL is a foundational blessing to the entire ecosystem, and deserves as much recognition as it can get! 
I would like to suggest my crate because I also need help with it :D.
It is a lib + cli to put csv files in a memory sqlite to allow queries over those files.
https://crates.io/crates/csv-query
A lot of cool stuff this week. I am impressed
Agreed! Thanks @nasa42 for kickstarting it with a host of good suggestions! (and also for tirelessly editing TWiR! )
simdeez looks kind of cool, though I have never used it.
I'll cheekily nominate my own crate, paste, which is a pastebin anyone can run that's made to take on Gist, written almost completely in Rust (there are Ruby shims to call Rust code via sidekiq).
ngx-rust - Official Rust binding for NGINX.
Argh @nasa42, how do you keep doing this? So much tasty Rust stuff, it is hard to choose! 
Mostly copy-paste from r/rust subreddit. 
Taizen - a TUI Wikipedia browser.
Percy - A modular toolkit for building isomorphic web apps with Rust + WebAssembly.
cargo-update - keep all crates installed via cargo up to date (even git ones)
I don't know if it does qualify, it was mentioned in New Crates section almost two years ago but never was a Crate of the Week
font-kit - Cross-platform font loading library written in Rust.