A rather convenient PHP-based system for sharing your files and collaborating with your colleagues and clients.
Formerly known as AjaXplorer, now called Pydio. Community version available for free here.
Another useful little thing from Autodesk. Tinkercad. A free online solids 3d modelling application.
Unlike many other free applications, it does allow downloading your model in a format you can actually use for something. Which is great.
Nearly perfect online image editor Autodesk Pixlr . For those cases when you don’t have any software installed to do the task.
Use BlueProximity utility to make your computer feel your presence and run certain commands on you (your Bluetooth-enabled smartphone, to be precise) either approaching or leaving it:
sudo apt-get install blueproximity
Make sure you do have gnome-screensaver installed, if you want it to lock/unlock your desktop:
sudo apt-get install gnome-screensaver
After configuring the BlueProximity you may add or replace the commands it runs as you wish. Use semicolon to separate individual commands (just like in bash).
Simple brown noise generation script using sox on Linux.
If you have forgotten what are the passwords for user accounts at your mail server, run the specialized dsniff utility while they are checking their mail:
dsniff -i any 'tcp port pop3'
It is better than other sniffers because it does not show you all the usual garbage, it cares only about user names and passwords.
Of course it will not work if the user uses STARTTLS or SSL/TLS connection security. After all, that’s what it is for…