AlwaysOnTop is a free macOS app that allows you to pin windows above others. It simplifies your workflow by reducing the need for constant Command+Tab switching.
macOS doesn’t support auto-scroll with the mouse wheel like Windows or Linux, but Scrollapp adds this feature and lets you change the scroll direction.
The utility BorderMe highlights the active window with a border, but it doesn’t work with all applications. The settings allow you to change the border style and background dimming.
Front and Center for macOS changes the logic of window management: for $4.99, you can choose between classic or modern styles and customize behavior to your liking.