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Authentication session id is passed using POST method (with AJAX feedback when signing in), therefore could be limited to single browsing instance (tab or window) and not be restored upon those closure.
To create an account: sign in like you would already have account with desired credentials.
By signing in, creating an account - You acknowledge and agree to Terms of Services.
Most of projects can be downloaded by non-logged Users by entering CAPTCHA for human verification. Although, there can be some projects or some of those releases (like nightly versions) that can be downloaded only by logged Users.
We do not provide option to reset or remind password, due to credentials being stored as scrambled collisional SHA1 hash.
Registered Users gain access (depending on authorization level) to some sections or enable features not accessible for non-logged page visitors. Also some of projects services, like autoupdate, require account authentication.