I've been using sc for many years. As others have noted, it's lightweight and fast. Some of it's unusual features are: 1. Each cell can contain both a label

I've been using sc for many years. As others have noted, it's lightweight and fast. Some of it's unusual features are: 1. Each cell can contain both a label and a value, so you don't need an extra column to label numeric values. 2. Cell editing is done using vi keybindings. 3. Files are stored in a very readable, pure text format. The biggest drawback of sc is there is no undo. If you delete something by mistake, you can't bring it back. This is the biggest reason to choose SC-IM, IMHO. Unfortunately, the menu commands in SC-IM are not the same as the ones in sc, which is a real problem on a keyboard-based spreadsheet and you have developed sc muscle memory :(. SC-IM's help menu is also hard to read in narrow terminal window, because it uses fixed-width line endings that cause every line to improperly wrap. The fact that sc is included by default in most, if not all, Linux distributions makes it so convenient to install and use I likely won't ever change.