Hashums

Hashums is a tool for conveniently computing and comparing file hashes.

Features

Compute the SHA-256 hash of all selected files (more hashes should be relatively easy to add in the future)
Compute a combined hash of all selected files (equal to the hash of the concatenation of each individual hash after sorting files lexicographically by their path)
Selecting folders and drives will select all files contained within them
Adds Hashums option to the Send to submenu of the context menu
Adds Hashums option to the context menu when right-clicking drives or the background of the current folder (Send to does not appear in the context menu in these cases)
Drag-and-drop files, folders, and drives onto the executable (or a shortcut or symbolic link to it)
Invoke through the command line, with each argument being the path of a file, folder, or drive

Selecting multiple drives at once in Explorer will open an instance of Hashums for each drive
Selecting drives and folders at the same time in Explorer, then right-clicking one of the selected drives, will not show any context menu option for Hashums

Selecting drives and folders at the same time in Explorer, then right-clicking one of the selected folders, will enable the Send to submenu in the context menu, allowing multiple drives to be selected and sent to one instance of Hashums