Veilleur is a simple api-based technology monitoring app that we use at Un zéro un.
It listens for Slack messages in a given channel, and when it contains an URL, it extract it with some tags.
Veilleur uses PHP7.0 and Symfony 3.0.
$ php bin/console veilleur:slack:import
$ php bin/console veilleur:slack:receive
This project will eventually accept contribution, but it is a simple side-project built for personal use. I won't be actively maintaining it. That's said.