Piriform
CCleaner (originally Crap Cleaner), developed by Piriform (a company acquired by Avast in 2017), is a utility used to clean potentially unwanted files and invalid Windows Registry entries from a computer. It is one of the longest-established system cleaners, first launched in 2004. It was originally developed for Microsoft Windows only,but in 2012, a macOS version was released. An Android version was released in 2014.