SynWrite combines great ideas from many well known editors into a single, freely available product. It's a complete environment for Web workers, coders and writers.
SynWrite's many features include macro recording, code highlighting, code folding, multi-caret editing and regular expressions.
You can easily extend the editor with plugins written in the Python scripting language. Many plugins are available here, and you can write your own.
You can easily configure it to your needs and even take it with you on a USB flash drive. It's free, open-source software.