hackerrank

Are you want to program some algorithms or some basic CS concepts ? I would say you can go and try it in https://www.hackerrank.com

Dynamic Programming | Set 10 ( 0-1 Knapsack Problem) | GeeksforGeeks

Its very interesting to watch GeeksofGeeks videos, if you are interested to learn algorithms and some cool solution for problems.

Rust applicatons

Are searching some of the applications written in Rust? below you have some of the interesting applications.

1. http://www.redox-os.org/  - operating system written in Rust
2. http://zinc.rs/ - Zinc is an experimental attempt to write an ARM stack that would be similar to CMSIS or mbed in capabilities
3. http://maidsafe.net/ - Maidsafe, a company that tries to create an encrypted, completely decentralized "successor" to the internet
4.https://github.com/servo/servo - Servo, the new browser engine being developed by Mozilla 
5. Iron is a high level web framework built in and for Rust, built on hyper.
ironframework.io/doc/iron/

6. wtftw, a tiling window manager - https://kintaro.github.io/rust/window-manager-in-rust-01/