mgSeek is a collection of free open source projects for searching a collection of images using visual similarity. The image you are looking for can be expressed either as a rough painted sketch or as another image you supply.
Don't waste your afternoon drawing UML sequence diagrams. Just enter the description, and this online tool will draw it for you. It can emulate the look of many other popular tools.
This is a pure JavaScript library to draw 2D graphics on web pages inside web browser without using SVG or VML. JavaScript developers, web developers and webmasters can take advantage of the library to add graphics drawing functionality to their web applications or websites using the library. The library is entirely written in JavaScript and does not need any plug-in or additional software to run/execute. The JavaScript source code of the library is open and free under a LGPL License.
A number of excellent packages and other tools have been developed which make drawing trees one of the easier tasks in LaTeX. Several are described here