Someone wrote an entire article dedicated to the surprising and stunning results of digital evolution:
https://direct.mit.edu/artl/article/26/2/274/93255
An old website that can only be accessed using an old browser than can still run FLASH programs has a nice real-time evolutionary simulation that evolves cars to drive on an increasingly rugged terrain:
http://boxcar2d.com/
You can’t access it with modern browsers as they refuse to allow FLASH to run, but if you have a virtual machine running (for example) an old windows XP installation with an old browser you can still access the website.
Someone made a newer version (with fewer options) that runs on modern browsers here:
https://rednuht.org/genetic_cars_2/
The advantage of this new version is it runs a lot of cars in parallel, rather than testing each car in the population individually(so you see results faster). But there are fewer options for customization of things like number of possible wheels, population size, selection algorithm and so on.
Avida-ED is a browser version of the evolution simulator Avida;
It’s much less visually stunning than boxcar and things like that, because it’s just colored squares on a grid, but what goes on behind the scenes is very interesting as it actually simulates the capacity for self-replication, and the digital organisms use and compete for limited “resources”(CPU cycles, and memory space), making it a true digital life simulator, and mutations can affect it’s ability to replicate and how this happens.
Here’s one that evolves a picture of your choosing: