⚠️ 2023 update: finally, macOS Sonoma has an option to disable pointer acceleration ⚠️
SmoothMouse is a mouse driver for macOS, created in 2012 by Daniel Åkerud and Eugene / Dae. It improved mouse pointer response, removing the infamous lag and provided a new way to configure mouse acceleration in macOS. At the peak of its popularity, it had approximately 40 000 users, including more than a hundred at Apple Campus in Cupertino.
In 2015 (El Capitan) Apple fixed the lag. A year later they have removed several system calls necessary for SmoothMouse to work. The developers have then decided to pause the project.
Thank you all for your support.
Looking to tweak mouse acceleration in macOS? Try these alternatives.