I'm looking for an easy to use wireframing tool. I've heard of gliffy, are there any others?
Specifically, I'd like something that is
- Easy to use
- Supports collaboration
- export to html and css
- lets me show the wireframes to the client. Allowing annotations would be a nice feature.
- low cost, or free
With LucidChart you can create interactive wireframes. They have a free version with a limited subset of the wireframing capabilities, but their subscription prices are very reasonable.
Creately
Creately isn't really free, but you can pay them whatever price you think it's right (even $1). Some features (from official website):
Mockingbird
Another option is Mockingbird. Their "motto" is:
Mockingbird is made using Cappuccino framework.
Balsamiq , not complete free but you can work with it.
Balsamiq
You could just wireframe in HTML.
Seriously, don't ignore the advantages of what straight HTML wireframing can offer to the process or what tools there are to make it easier and effective. Things like jquery and polypage make HTML a very powerful and capable wireframing and prototyping tool.
I wrote a blog post a while ago that explains some of the advantages and tools of straight HTML wireframing (sorry for the gratuitious self promotion).
Firefox pencil plugin
Another great website wireframe/mockup tool is Mockingbird ... it's collaborative and does decent export.