The best open source alternative to BleachBit is Pearcleaner. If that doesn't suit you, we've compiled a ranked list of other open source BleachBit alternatives to help you find a suitable replacement.
BleachBit alternatives are mainly Productivity & Utilities. Browse these if you want a narrower list of alternatives or looking for a specific functionality of BleachBit.
A free Mac app cleaner that removes leftover files, strips universal app architectures, manages launch agents, and includes Finder integration with drag/drop support.

Pearcleaner is a powerful and completely free Mac app cleaner that goes far beyond simple app removal. Born from the need for a comprehensive macOS cleaning solution, this open-source tool helps you reclaim valuable disk space by finding and removing leftover files that standard uninstalls leave behind.
Key benefits include:
The app features drag-and-drop simplicity, deep link automation support, and a customizable theme system. With its tiny 210KB sentinel monitor using just 2MB of RAM, Pearcleaner works silently in the background. Licensed under Apache 2.0 with Commons Clause, ensuring it remains free forever while preventing commercialization.