Contexts hasn't had any updates in a while, but is still far and away better than anything else I've tried. There haven't been any regressions as MacOS has updated since the last version.

It's one of those "How did I manage before without this?" apps.

One of my favorite features is quick switching by holding down Caps and typing some of the Application / Window name. When releasing Esc, the selected window will be focused. So if you know the window you want to switch to, it's extremely fast.