xkeysnail

A keyboard remapping tool for X environment written in Python. It's like xmodmap but allows more flexible remappings.

Pros:

• Has high-level and flexible remapping mechanisms, such as per-application keybindings can be defined multiple stroke keybindings can be defined such as Ctrl+x Ctrl+c to Ctrl+q not only key remapping but arbitrary commands defined by Python can be bound to a key
• Runs in low-level layer (evdev and uinput), making remapping work in almost all the places

Cons:

• Runs in root-mode (requires sudo)

The key remapping mechanism of xkeysnail is based on pykeymacs (https://github.com/DreaminginCodeZH/pykeymacs).