Somewhat similar to activitywatch, etc.

Takes snapshots of currently open/active windows and their titles. (By default every 60s, can be more fine-grained.)
Snapshots can then be reviewed and tagged automatically through writing a categorization config file,
e.g. tagging all browser titles with ^.*//scholar.google.com/.*$ as Research, or as Research:Papers, to get even more finegrained.

Allows idle-detection and tagging to remove.

Data can be exported out to .log files or to csv files.