This is an open-source project, hosted on GitHub: https://github.com/janosgyerik/webdict

Your contribution would be much appreciated, feel free to extend and improve!

Get the source code
git clone https://github.com/janosgyerik/webdict
Issue tracking, bug reports
https://github.com/janosgyerik/webdict/issues

Requesting more dictionaries

If you would like a new dictionary added, feel free to create an issue for it on GitHub! Make sure to include the URL to the dictionary content, ideally a compressed file, or a database that can be queried easily to extract the content. Also make sure the content has a permissive license that allows free distribution online.

These other freely available dictionaries might be interesting to add:

This related project might help parsing raw dictionary content:

https://github.com/janosgyerik/dictgen