Like CCleaner, it is a lightweight, but powerful program that bundles a disk space cleaner and privacy manager that can identify and delete temporary and cached files in web-browsers, mail clients, and other software, like Java, Flash, Adobe Reader, Skype, Google Earth, MS Office, Libre Office and various other apps. BleachBitīleachBit is a free, open source computer maintenance software that’s available on all three major platforms – Windows, Linux and Mac. So for those who are waiting anxiously to see what comes of Avast’s acquisition of Piriform, we have prepared a list of the 7 best CCleaner alternatives you can use: 1. The acquisition has left many people on social media and online message boards wondering about the future of their favorite computer maintenance utility after the takeover. Recently, however, Piriform Software Limited, the London-based software firm that owns and develops CCleaner, was acquired by Avast Software, a Czech software firm best known for its highly-popular eponymous antivirus program.