is a multi-platform academic
Binary Decision Diagrams
Biddy is free software released under GPL.
Biddy uses ROBDDs with complement edges.
Biddy supports automatic garbage collection and sifting algorithm.
Biddy is oriented towards readable and comprehensible source code in C.
Biddy is used in EST, a tool for formal verification of systems.
bddview is a pure Tcl/Tk script for visualization of BDDs.
bddview is a graph viewer only and does not use a BDD package.
bddview has been released into the public domain.
BDD Scout is a demo application demonstrating the capability of Biddy and bddview.
You will need
Tcl/Tk + BWidgets
to run it.
You have to install Graphviz
to be able to visualize BDDs created by Biddy.
You have to install Ghostscript
to be able to export BDDs as PNG images and PDF documents.
If you want to try BDD Scout, download it. Statically linked program should run even if Biddy library is not installed on your computer (and it will not use your Biddy library if
you have one). Deb and rpm files include dynamically linked program,
thus you will also need appropriate libbiddy and extensions packages.
If you want to make your own project using Biddy, you need the
development version of Biddy.
If you try to run a program which uses Biddy library, but you do
not have it, download the binary version of Biddy. It contains Biddy
If you are interested in changing Biddy library, download the
complete source code of the Biddy project, which includes sources
of bddview, sources of BDD Scout, and also various makefiles and
The latest sources can be obtained from
Savannah SVN repository.
Please, ask for packages of other types or for other systems and we will generate it.
Bugs can be reported via author's email or through
Ubuntu users, please use
Windows users, please check
Biddy in Visual Studio projects.
You can fork this project on
Here is a HTML documentation produced by doxygen.
Here is a PDF documentation produced by doxygen.
Here is a small biddydemo1.c demonstrating usage of Biddy library in C projects.
Here is a not-so-trivial biddydemo2.cpp demonstrating usage of Biddy library in C++ projects.
User's manual and Programmer's manual are not ready, yet.
R. Meolic. Biddy - a multi-platform academic BDD package. 2012
G. Janssen. A Consumer Report on BDD Packages. 2003
K. S. Brace, R. L. Rudell, and R. E. Bryant. Efficient Implementation of a BDD Package. 1990
Biddy the Hedgehog - an unrelated, but nevertheless interesting project!
BDD Scout v1.2
The zoom-out capability allows you to see the whole BDD
You can move nodes and subgraphs
The results of IFIP benchmark test