The Open Workbench Logic Sniffer is a great tool for everyday tasks in electronics. It is a cheap logic analyzer with software for all major operating systems. As a bonus, the hardware is open-source!
As of 2012-03-02, OLS is the most up-to-date software being updated regularly.
OLS (jawi / ols )
Jawi’s Logic Sniffer client software
Installing the latest OLS on Ubuntu 12.04:
sudo apt-get install maven2 openjdk-6-jdk cd ~/Downloads git clone git://github.com/jawi/ols.git cd ols mvn clean install