Ask HN: Which C/C++ based Open Source Project to work on?

Hi, I have been working on the GTK+ components like pango and freetype for the last 2 years as a middle-ware software developer. Now, I am switching my role from that to a Content Writer. The role, as you can guess, would require less or no coding. But, I don't want to lose my touch with coding. That is why I am looking for an active Open Source Project where I can contribute. Please suggest a C/C++ based project.