Nintex Workflow allows you to create complex workflows visually by easy to use drag and drop hence building a fully logical flow with conditions, alerts via mail or other, escalate and a lot more..
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Today you're still using Microsoft InfoPath ?
Then you already know that InfoPath is no longer developped and that within the next couple of years InfoPath support will end.
Nintex Forms has had an alternative for years which offers a lot of extra possibilities and is ready for mobile devices like tablets and smartphones.