On Ubuntu from PPA.
sudo add-apt-repository ppa:colin-i/ppa
Or the Manual installation step from this link:
sudo apt-get install ocompiler
There is also ocompiler-dev.
On linux distributions, .AppImage file from releases.
On Fedora, .rpm file from releases.
yum install ocompiler-*.*.rpm
On Windows, .windows.zip file from releases.
Documentation is at o.html.
Preferences file.
The Donations section is here.