I am looking for a simple UML-tool that will let me do for example a sequence diagram quicker and better than Word from scratch (Without spending to much time on learning the tool, and with the tool more supporting me than constraining me)
Primary choice is Visio.
I have used many options available in the market for drawing. If asked personally, Visio is one of the best diagramming software that I have ever used. I am using it for drawing ER and UML diagrams from past 8 months.