Copyright © 2006-12 Qtrac Ltd. All Rights Reserved.
We provide consultancy—code reviews, mentoring, programming, and training—in the C++, Go, Python 2 and Python 3 languages, and in the Qt 4 and PyQt4 libraries. We also provide technical authoring, editing, and typesetting services. All services are provided by programmer and author Mark Summerfield (mark@qtrac.eu).
Our books are listed on the right. Our most recent publications are Programming in Go: Creating Applications for the 21st Century and Advanced Qt Programming. We also have a free download, Moving from Python 2 to Python 3 (4 pages, 676K PDF)—a very concise summary of Python 2 ↔ 3.1 differences plus new Python 3.1/3.2 features.
In addition to the example applications which accompany our books (some of which are useful in their own right), we have also created and maintain additional free and open source software, the most popular of which is DiffPDF. This is a GUI application for comparing PDF files page by page, either textually or by their appearance. Available prebuilt for Debian, Fedora, Ubuntu, Mac OS X, and Windows, and in source form for other platforms.