It very much depends on the type of project, the programming language(s), scope and scale. I tend to focus on things that I'm passionate about and look for rep

It very much depends on the type of project, the programming language(s), scope and scale. I tend to focus on things that I'm passionate about and look for reputable and popular open source projects in that area, ie VLC, Audacity, GIMP etc. This website has several great projects so worth taking a look to see if something catches your eye: https://www.codetriage.com/ https://www.codetriage.com/