In this case, I needed two specific and diverse solutions to a few problems I had.
Problem 1: I needed a way to embed an editable spreadsheet in a web page without any special plug-ins or proprietary Microsoft scripts. In basic terms: a web spreadsheet application.
The power of this software is it's simple ability to allow any web user access to a simplistic replica of Microsoft Excel. It closely resembles Microsoft's product in form and function, so there isn't much of a learning curve. Best of all, it's relatively lightweight size-wise and seems to have a robust feature-set. Overall, I think it's a great solution for a tough problem.
Problem 2: I needed a simple yet powerful text editor that would allow a user to post content to the web without the need to know any html or any knowledge beyond Microsoft Word. In basic terms: an advanced rich text editor.
Solution: After lot's of research, Moxiecode's TinyMCE seemed to have the easiest to use and most robustly supported Rich Text Editor I could find at this time.
When fully decked out, this thing looks almost exactly like Microsoft Word… and has almost all of the features. Some highlights: real-time spell checking, table support, image insertion (even an optional file/image management system), a fully-compliant gzip compressor, and support for PHP, JSP, .NET, and Coldfusion. It works well and I'm thoroughly impressed by the wide range of plug-ins and options available for the software.
So, remember to check them out if you have a need for some powerful WYSIWYG tools for your next web project. And no, neither one of these companies paid me for this review. I truly just like them a lot!