OpenSCD, the SCL editor for your browser, allows you to engineer and validate IEC 61850 substations.
Secrets can be used to split a secret text into shares to be distributed to friends. When all friends agree, the shares can be combined to retrieve the original secret text, for instance to give consensual access to a lost pin, a password, a list of passwords, a private document or a key to an encrypted volume. Secret sharing can be useful in many different situations and this tool is a simple and well documented free and open source implementation available for anyone to use from this website,
Dowse is a transparent proxy facilitating the awareness of ingoing and outgoing connections, from, to, and within a local area network. Dowse provides a central point of soft control for all local traffic: from ARP traffic (layer 2) to TCP/IP (layers 3 and 4) as well as application space, by chaining a firewall setup to a trasparent proxy setup. A core feature for Dowse is that of hiding all the complexity of such a setup.
Slouchy is for anyone who wants to work on their posture while at a computer. After a quick setup it will periodically alert you if you start slouching at your computer. It's written in Python and depends on the OpenCV and QT4 libraries.