"Where Is" is a visual tool for fast searches in text files. E.g. it can be used to look up words in C/C++/Java/ Basic or other source files. But it is also very useful when searching in any other kind of text file.
Butterfly XML Editor is an IDE built on top of a new real-time incremental XML parsing algorithm. The editor features syntax and error highlighting, incremental validation, code completion, XSLT pipelines, and side by side DOM and source viewing.