A-ESA is about a modeling approach. A-ESA is meant to explicitly convey architectural intent, and the simple modeling forces you to think succinctly and holistically.
Below is a screenshot of the simple web-version of the A-ESA tool.
The web version of the demo tool can be accessed from here. It is adapted from an open source, with only limited editing actions. For A-ESA tool support queries, please contact us at contact@a-esa.com.