net viel [nɛt fiːl] (Swabian for "not much") allows searching through an e-mail archive indexed with notmuch from a browser.
The original idea (of which it falls way short) was to search e-mails in a local Maildir with the convenience of a GMail-like interface.
Technically, it is a single-page web app (based on the Open WC Starter App) with a Python REST API as backend served with Flask.
python3 -m pip install netviel --user
(Nonsensical e-mails generated with the help of Faker.)
See here for a demo instance with random e-mails (but no attachments or HTML e-mails, which net viel supports as well).
Note that the initial startup of the demo could take up to half a minute until the Heroku dyno (free tier) wakes up, after that it should be snappy.
You need to have notmuch installed with its Python bindings. On Debian-based systems, this is achieved with
sudo apt install notmuch python3-notmuch
Python 3.6 or above is required.
The web interface accessing your local notmuch database is opened simply with
python3 -m netviel
The Flask default port 5000 can be changed with the --ports option.
To run net viel locally and make changes to the code, follow intructions on this page.