The 1-Wire bus is a cheap low-speed bus for devices like weather sensors, access control, etc. It can be attached to your system via serial, USB, I2C, and other interfaces.

ZSI is a Python package that provides an implementation of SOAP messaging, as described in The SOAP 1.1 Specification. In particular, ZSI parses and generates SOAP messages, and converts between native Python datatypes and SOAP syntax. It can also be used to build applications using SOAP Messages with Attachments. ZSI is ``transport neutral'', and provides only a simple I/O and dispatch framework; a more complete solution is the responsibility of the application using ZSI.

Racket (previously PLT Scheme) is an innovative programming language that builds on a rich academic and practical tradition.

In Taiwan, the customer usually get the gross price. But on the invoice we have to write the net price with tax. This program helps you to reverse calculate the gross price to net price and tax. And automatically adjust the net price if needed.