Cloud storage service
|IRC channel||(on hackint)|
aDrive is a cloud storage service, which previously offered a free "Basic" tier, but will closing it and deleting all free files on Nov 16, 2015. 
Leaving off the file name part (the last section of the first URL) also works. There are also URLs of the form: www.adrive.com/public/overlimit which appear to be shown when more than 10 people are trying to download the same file.