[donaldguy]

While the cli forms of the various "defaults" registry commands are interesting and useful for e.g. scripting provisioning of many new machines, on a one-off basis it's probably easier to just use TinkerTool (https://www.bresink.com/osx/TinkerTool.html) which offers most of them with checkboxes or radio buttons

(One could argue about safety/visibility/trust but it's really probably no worse, and possibly better, than any installer to which you give your password)

[sdfjkl]

I quite like the badge: https://www.bresink.com/osx/FullSoftware.html

[nerdponx]

There's also OnyX: http://www.titanium.free.fr/