Calc

What it does

A spreadsheet editor (a port of IronCalc) that everyone in the room edits together: cells, formulas like SUM, formatting and several sheets. Changes from one person show up in the others' sheets. Handy for a trip budget, a shopping split or a small table the group keeps; the authors warn that editing the same cells at the same moment is not reliable yet.

How to use it

1. Click a cell and type a value or a formula such as =SUM(B2:B4)
2. Press Enter to confirm
3. Everyone in the room sees the change in their copy
4. Use the toolbar for formats and the + at the bottom for more sheets

Screenshots