The author of the Russian SEO/IM site ProfitHunter.ru has created a free PHP script that calculates competition/searches for a list of keywords – nTrendsMaster.
Details and a download link can be found here.
The script is fairly basic, but it might be useful for those interested in a web-based, free alternative to GTrends SE. The PHP script uses a slightly different algorithm (the results might be unexpected…) and requires a Google account. You will need some basic webserver administration/PHP skills to set it up.