I don't trust that the organization, or whoever it gets sold to in the future, won't try to monetize my email address, from now until forever.
I changed some of my plans. Marta will become open much earlier, maybe even the next week. Sorry for the inconvenience.
https://github.com/caskroom/homebrew-cask
EDIT: details on how to add your own Cask for an app:
https://github.com/caskroom/homebrew-cask/blob/master/doc/de...
Just if it was not clear: my email is public on many services. I just think that if you require my email to get the installer, how much logging/tracking code will you run once you're on my machine?
I know it's all about trust, but Marta doesn't have any tracking code, and never will. Trust is much more important that any statistics.
It's the same with me. If I am using a really early stage app and actually helping with testing it the last thing I would want to do is to pretty much sign up for it with my email unless I desperately need that app.
You need to freely provide the download. No one is going to give you their email address to download what should be an open source project.
But I completely understand you. I hope Marta will be available for everyone quite soon (maybe at the time of 0.2).