Piriform Software

CCleaner (; originally meaning "Crap Cleaner"), developed by Piriform Software, 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, and an iOS version was released nine years later.

Recuva () is an undeletion program for Windows, developed by Piriform Software.

Speccy, developed by Piriform Software, is a freeware utility software and runs under Microsoft Windows 11, Windows 10, Windows 8, Windows 7, Vista and XP for both IA-32 and x64 versions of these operating systems, which shows the user information about hardware and software of the computer. The information displayed by Speccy includes processor brand and model, hard drive size and speed, amount of memory (RAM), information about graphics card and operating system. Speccy is used to monitor what hardware is present in a system and how it is being used.

Defraggler is a freemium defragmentation utility developed by Piriform Software, which can defragment individual files or groups of files on computer memory systems. Defraggler runs on Microsoft Windows; it has support for all versions since Windows XP. It includes support for both IA-32 and x64 versions of these operating systems.