When you want to download some torrents on a different machine and get a direct link to download it back through HTTP, you don't have much choices. But Cloud Torrent is one of them.
When you want to check how fast/good is your internet connection, you usually do a speedtest. In some cases, you may even want to host such speedtest in your infrastructure (Local network, network of customers,...) or just to provide such service to your community.
Before Instagram, image hosting scripts were quite popular to create our own image hosting website. The most popular opensource apps were Chevereto. I'm happy to see that the dev is still maintaining it!