A tool that has as its dependencies practically every useful and still-supported Golang linter and static analyzer out there. Plug it into your toolchain and it'll do the work of two dozen other tools (which it is, really) in less time.
Can also be used locally, through your IDE or editor.
BinNavi is a tool for performing static and dynamic reverse engineering of executables for a number of platforms - x86, ARM, PowerPC, and MIPS. Can connect to remote debuggers on other systems to examine running code. Extensible with scripts, can annotate call flow graphs. The source is on Github: https://github.com/google/binnavi