The Biochemical ALgorithms Library (BALL) is a framework for rapid application development in molecular modeling and structural bioinformatics. BALL provides an extensive set of data structures as well as classes for molecular mechanics, advanced solvation methods, comparison and analysis of protein structures, file import/export, NMR shift prediction, and visualization. Its extensibility results from an object-oriented and generic programming approach.
BOTEC is a simple but useful calculator that assists with astrophysical, orbital mechanics, and space navigation calculations. It is a "back-of-the-envelope calculator" rather than an industrial-strength calculator, although this may change in the future. It is primarily intended for people familiar with physics and Python, and as such is unlikely to be useful to the average end user. It includes solar system data, and all values are strictly in SI units.
Berkeley DB XML is a native XML database engine for use within your product. Made available as a C++ library with language bindings for Java, Perl, Python, PHP, and Tcl, it integrates directly into your application (it is not a standalone database server). It provides XQuery access into a database of document containers. XML documents are stored and indexed in their native format using Berkeley DB as the transactional database engine.
The BitNami DjangoStack is an all-in-one installer that greatly simplifies the installation of Django and its runtime dependencies. It includes ready-to-run versions of Python, Django, MySQL, and Apache. It supports Linux, Windows, and OS X, so you can share the same Django environment on multiple platforms.
BlackAdder is an application development environment that allows professional and hobbyist programmers alike to produce complex applications for the Windows and Linux platforms. It brings together the Python programming language, the Qt graphical user interface toolkit, ODBC database connectivity, and an Integrated Development Environment (IDE) that includes an editor, a GUI designer, a debugger, and an interactive Python interpreter.
Boa Constructor is a cross-platform RAD GUI-building IDE. It offers visual frame creation and manipulation, an object inspector, a debugger, integrated help, and many views on the source, including inheritance hierarchies, object methods and properties, and HTML generated from documentation strings. It is written in Python and uses the wxPython toolkit which wraps wxWindows.