ELF Workbench is a program intended for analyzing/inspecting ELF object files that also allows to patch them. It provides an interactive user interface similar to that used by GDB.
See feature list below for more details.
My motivation for starting this project was to attach to the process of my Super Nintento emulator and change memory. This program can attach or start a process and manipulate its memory in a lot of ways.
FLEP (short for FLExible Patcher) is a multi-purpose binary patching engine with fully configurable behaviour. It allows you to patch existing binaries with static (pre-defined) hex data and/or dynamic parameters.