Oh man, we had DC++ semi-officially endorsed by the inter-college IT department at my university in 2013/14. It was fantastic, especially since in my first year we only got 5 GB of data per month (with a large number of unmetered sites, including anything from Google), so without the unmetered file intranet it'd have been really hard to manage. Unfortunately as they increased the data caps it killed the popularity of DC++, which ended up getting killed off not long after I left.