Queue Trainer is an app aimed at training your mouse coordination and improving your accuracy in both FPS and MOBA style games. Each set of practice modes spawn a random distribution of targets to promote better reactions as well as improved precision and accuracy. Additionally, these practice models feature a minimap, which is designed to help with map awareness by showing where possible enemies are coming from. The FPS practice also features a flash band warning and overlay to help improve reaction times against enemy flashes.
https://websturna.itch.io/queue-trainer
Here is how the boba practice tool looks like.
Source: itch.io