Open source is term used primary for software but nowadays things are changing and there are more and more open source hardware projects like ANAVI Light Controller.
Open source hardware is a design of a physical object that is publicly available so that anyone can study, modify, distribute and make it. Sharing knowledge and ideas for free is important therefore open source matters!
Often there are open source hardware projects designed with proprietary expensive software. Does it make any sense? I don't think so therefore all my open source hardware project are designed with the free and open source software KiCad. Started as a project in 1992, KiCad has a long history and a huge community. It runs on Windows, macOS, Linux and even FreeBSD. Since 2013 CERN BE-CO-HT section has been actively contributing resources to the further development of KiCad.
The Open Source Hardware Association (OSHWA) certification was created a couple of years ago in response to overwhelming demand for a more transparent and straight-forward method of identifying real open source hardware products. The design of ANAVI Light Controller is available at GitHub under Creative Commons Attribution-ShareAlike 4.0 International license. Revision 1.3 of ANAVI Light Controller was recently certified by OSHWA with UID BG000005.
As a backer of ANAVI Light Controller you are supporting open source. As a free bonus you will receive complementary KiCad stickers.