Hourglass - Hourglass is the most advanced simple countdown timer for Windows.
Startup Delayer - Startup Delayer gives you the power to optimize your Startup Process by delaying applications from starting up as soon as you log into your computer. By delaying the applications during start up, your computer becomes usable a lot faster.
wnr - Better than pomodoro, this timer app balances work and rest.
Autorun Organizer - Free startup manager with delay option.
Free Countdown Timer - Free Countdown Timer is a free, full-featured and user-friendly countdown timer for Windows
Autoruns - See what programs are configured to startup automatically when your system boots and you login.