Cutter. The disassembler I'll be using for demonstrations. (really a frontend for r2)
https://github.com/radareorg/cutter/releases/download/v1.7.2/Cutter-v1.7.2-x86_64.Linux.AppImage

Gdb-Peda. A gdb extensions meant for exploit development. I personally don't like this, however some people think it makes gdb much easier to use.
https://github.com/longld/peda


PwnDbg
Another gdb extensions for exploitation with gdb. Reccomended by Duc. Gives various useful commands for inspecting memory such as telescope 0xaddress.
There are other useful commands, talk to Duc for more information.
https://github.com/pwndbg/pwndbg