The best open source alternative to DaisyDisk is WinDirStat, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to DaisyDisk and 14 is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to DaisyDisk are Baobab Disk Usage Analyzer (Free, Open Source), ncdu (Free, Open Source), DiskUsage (Free, Open Source) and GrandPerspective (Free Personal, Open Source).
Baobab Disk Usage Analyzer is a graphical application to analyse disk usage in any Gnome environment. Disk Usage Analyzer can easily scan device volumes or a specific user-requested directory branch (local or remote).
DiskUsage provides a way to find out which files and directories on the SD card of your Android phone are consuming the most space. It displays diagram with directories/subdirectories proportional to their size. Users are allowed to zoom in to look at specific directory content.
GrandPerspective is a small utility application for Mac that graphically shows the disk usage within a file system. It can help you to manage your disk, as you can easily spot which files and folders take up the most space.
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Almost everyone thinks GrandPerspective is a great alternative to DaisyDisk.
Features: Scan local, remote or removable disks. Configurable color schemes. File system navigation by mouse clicks. Information about files and directories on hovering. Files and directories can be copied or removed directly from the context menu.
K4DirStat, fork of KDirStat , is a small utility program that sums up disk usage for directory trees, very much like the Unix 'du' command. It displays the disk space used up by a directory tree, both numerically and graphically.
GdMap is a tool which allows to visualize disk space. Ever wondered why your hard disk is full or what directory and files take up most of the space? With GdMap these questions can be answered quickly.
Free open-source cross-platform file & directory statistics as found on Github - Generate a directory tree for any given folder - View any folder as colored rectangles (squarified algorithm) - Customize the rectangle colors and show statistics about filetypes - Export...