From: http://www.eithermouse.com/

Instantly changes settings when any mouse is used:
swap buttons
mirror cursor
adjust speeds
and more...

From: https://autohotkey.com/

AutoHotkey (AHK) is a free, open-source macro-creation and automation software for Windows that allows users to automate repetitive tasks. It is driven by a scripting language that was initially aimed at providing keyboard shortcuts, otherwise known as hotkeys, that over time evolved into a full-fledged scripting language. And if you're really interested, here's a great video about it 

From: http://www.autoitscript.com/site/autoit/

  AutoIt v3 is a freeware BASIC-like scripting language designed for automating the Windows GUI and general scripting. 
  It uses a combination of simulated keystrokes, mouse movement and window/control manipulation in order to automate
  tasks in a way not possible or reliable with other languages (e.g. VBScript and SendKeys). AutoIt is also very small, 
  self-contained and will run on all versions of Windows out-of-the-box with no annoying “runtimes” required!
  
  

From: http://dropit.sourceforge.net/

  When you need to organize files, DropIt can eliminate much of the drudgery of searching and manually opening folders and moving files around.
  You can configure DropIt to perform 15 different actions on your files and folders (Move, Copy, Compress, Extract, Rename, Delete, Open With, 
  Upload, Send by Mail, Create List, Create Playlist, Create Shortcut, Copy to Clipboard, Change Properties, Ignore), filtering files by name, 
  directory, size, date, properties, content or regular expressions. You can even save sets of associations in profiles and associate a profile 
  to each desired folder, to scan monitored folders at a defined time interval.
  

From: https://a9t9.com/