Hello Nadir.
There is nothing wrong in the distribution of your antescofo code on github or elsewhere. But including the spat object in your package is not advised: the object is not freely available and users need to purchase it or to have a license elsewhere.
For the antescofo object, its status has changed very recently and is now freely accessible from the Forum. An official announce is expected soon. However, until the official announce which will fix the details, consider to redirect the users to the forum to download freely an antescofo object (after a free registration). In this manner, they are ensured to have the latest version and we are able to have some statistics on antescofo usage, which is very important for us.
In the long run, ca we consider to include your library into the user-contributed part of the antescofo documentation?