FireDaemon!

nssm is a service helper which doesn't suck. srvany and other service helper programs suck because they don't handle failure of the application running as a service. If you use such a program you may see a service listed as started when in fact the application has died. nssm monitors the running service and will restart it if it dies. With nssm you know that if a service says it's running, it really is. Alternatively, if your application is well-behaved you can configure nssm to absolve all responsibility for restarting it and let Windows take care of recovery actions. »

TSM is a very small tool to configure your services.

AlwaysUp is the true set-it-and-forget-it way to run your mission-critical Windows application 24/7, unattended, starting it at boot and monitoring it to ensure that it is always running, even if it crashes, hangs, or fails.

Launcher Service lets you run any program as a Windows Service.

Daemon Master is a software which makes it possible to create and manage a Windows-service from any program. (Alpha)

Application as Service is an advanced system tool which lets you run any application as Windows Service. You can easily configure Application as Service using its intuitive GUI interface or command line configurator directly from your software.

Winserv is an utility that can create an NT service that runs any application. When the application exits, the service becomes stopped. It is also able to manage local and remote NT services that were not created by winserv.