BCUninstaller (Bulk Crap Uninstaller) is a free, open-source Windows uninstaller that can remove multiple applications at once, saving you a lot of time.
It automatically scans for and deletes leftover files, registry entries, and shortcuts for a deep clean, and can force-uninstall stubborn programs and corrupted installers. It runs on Windows 7 and above, and there's a Chinese portable edition — no installation needed, just open and use it.