I wrote the Threat Scan plugin about 8 years ago, I think. I fixed a few bugs and then forgot about it. It looks into the WordPress installation for dangerous code.
I recently noticed that it has over 1,000 users and still gets downloads in spite of being listed as inactive.
I gave it a brush up and updated the WordPress.org site with the new code. I had a bear of a time doing it. It had been 6 years since the repository had been updated. I have changed machines twice, joined with a new co-developer, and changed passwords since then. The plugin did not want to update.
I finally got it all fixed and the plugin already has a new download after two minutes.