Quark is an editor written in Haskell that started as a learning project with the aim to replace nano with something similarly simple and clean, but somewhat more powerful. It is slightly inspired by Atom, hence the name (in other words quark as in the elementary particle, not the dairy product), as well as a few other editors and IDEs.
The project has been abandoned.
To build and install quark from source:
git clone https://github.com/sjpet/quark.git
cd quark
stack build
After this, you may wish to copy the man page to some suitable location, for example:
sudo cp doc/quark.1 /usr/local/man/man1