Sourcetrail is a cross-platform visual source explorer based on LLVM/Clang LibTooling
by Eberhard Gräther
From the article:
Sourcetrail 2018.4 features big improvements on indexing performance and reduced memory consumption. The new tab bar in the application window allows for opening multiple symbols simultaneously, just like in a web browser. Also, new type-use edges were added to the graph visual, to make exploration of types easier when templates are involved.