low cost wireframing/diagramming solution?

I am a front-end developer who only occasionally has need for a
wireframing/diagramming application.
I had been using an online tool called Lovely Charts for a previous project,
and was going to turn to it again for some new work, but found that they
wanted to charge a fee to save more than one project.

I thought if I was going to spend any money that it might be possible to
find a better solution and figured I would turn to the community for help.

If any of you have any recommendations, at an entry-level price-point, I'm
all ears!

Thanks in advance.
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