Linear circuit analyzer program
This linear circuit analyzer program runs in your web browser. The software was written in JAVA programming language, there's no need to download or install anything, provided that you enabled JAVA in your browser's settings.
UPDATE: That was true till 2016, when polular browsers like Chrome and Firefox stopped supporting JAVA applets. Nowadays this program runs only in older, less popular browsers like Internet Explorer (Yes, I know, who uses that?) I don't have time to port this program, so it will remain like this.
You can build a circuit which contains voltage generators, current generators and resistances, and the program calculates the current intensity in each current branch.
If you like this software, please put a link to your blog or website!