phaolo: By the way, it's a shame that Gog has never offered an official tool to
properly manage standalones (and they even killed the Downloader).
Third party tools can stop working and stop being maintaned at any time.
So can official tools, such as GOG Downloader. ;)
It has both benefits and drawbacks that e.g. gogrepo is third-party (and open source):
+ If someone abandon's the development and maintenance, someone else can pick it up.
+ People can even make their own versions of the tool, making it include features that they want.
+ Overall I think it is easier to get feature requests implemented in an open-source third-party tool, than an official one.
+ The user-made tool can be lower-profile without a GUI or such, which can make the tool more cross-platform, like is the case with gogrepo. I can run gogrepo on e.g. my Raspberry Pi, while I couldn't run e.g. Galaxy or GOG Downloader on it, as they are Windows-only and x86-only. Gogrepo doesn't care what OS or CPU architecture I am using, it just works.
The only real reason why I might prefer GOG coming up with a similar official (mass-)downloader tool would be that they could implement e.g. peer-to-peer support to the tool properly. Properly here meaning that it lets you download with p2p only games that you have purchased. I presume that in e.g. Bittorrent terms, GOG would act as the tracker server which decides whether you can initiate a download for a certain file from other GOG users.