These are a just a few applications I find useful and you might too.
Evince Document viewer for Windows
Teamviewer version 12 for Windows
Teamviewer viewer 12 for MAC
Youtube Clip grab – audio/video
Invoicing application – Web based
Complete FREE OFFICE suite software – Linux, Mac, Windows etc.
PDF Split and Merge tool
Dual pane file manager for MAC
Dual pane file manager for Windows
Backup software for Windows