This widget lists repository’s your widget list onto your sidebar automatically. So you do not need writing troublesome widget list anymore. If you update source file (and readme.txt), the widget pulled information from wordpress.org after it published.
checkout more detail at description page:
Place file in your /wp-content/plugins/ directory and put every thing init. Then activate this through the administration panel, and then go to the widget panel and drag it to where you would like to have it!