This freeware scheduler launches apps and documents at predetermined times or frequencies. It can be used as a standalone app or system service. It's a Windows version of UNIX Cron.

One of the most impressive aspects of nnCron LITE is its variety of features. Users can choose to start nnCron LITE as a system service or as a regular standalone application. Additionally, nnCron LITE understands cron table format and is managed with easy-to-edit text crontab files that are fully compatible with Unix crontabs. It can handle and restart missed tasks, set and use environment variables, run applications authorized as the currently logged-in user (WinNT/2000/XP), and be extended with plugins written in the Forth language.
nnCron LITE is intuitive and easy to use, and its features are customizable to fit the needs of individual users. Not only is it not resource-demanding, but it can also run quickly and efficiently even on older PCs without experiencing any noticeable performance degradation. In our tests, we have never seen nnCron LITE system service allocate more than 150k of operative memory.
Overall, nnCron LITE is a tiny yet powerful software that Windows users can rely on for scheduling tasks. However, if users are in need of a full-blown automation manager, nnCron may be a better fit.
Version 1.17: This is a bugfix release. No new functionality was added.