Apps similar to Secretarybird include OpenRGB, which is free and open source. Other options are X-Mouse Button Control, LinearMouse, OpenRazer and Artemis RGB. You're spoiled for choice with Key Mapping Tools like Secretarybird: we list more than 25 alternatives for Windows, Linux, Mac, the web and Android.
Gnome15 is a suite of tools for the Logitech G series keyboards and headsets, including the G15, G19, G19s, G13, G930, G35, G510, G510s, G11, G110 and the Z-10 speakers aiming to provide the best integration possible with the Linux Desktop.
Open-source Linux gaming mouse configuration and remapping: map mouse buttons to keyboard keys, configure supported DPI and polling rates, and help test new hardware. It remaps extra mouse buttons through evdev/uinput, including mapping a mouse button to a keyboard key...
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Let you bind anything to any button on most peripherals that will work with xinput on linux.
