Pocket Scanner - Pocket Scanner is the best app for quickly scanning documents to JPEGs or multi-page PDFs.
PuTTY - Popular free terminal application. Mostly used as an SSH client.
PaperSave - PaperSave is a complete document management, electronic workflow and transaction (invoice and gift) automation solution, for Microsoft Dynamics and Blackbaud.
MobaXterm - Enhanced terminal for Windows with X11 server, tabbed SSH client, network tools and much more
ccScan - ccScan provides solutions to scan or import documents directly to the cloud storage providers.
iTerm2 - A terminal emulator for macOS that does amazing things.