Because "Sak nab zip" does not correspond to a known official application or service, use extreme caution if you found this link on a third-party site or social media.
The terms "Sak," "Nab," and "Zip" (or "Sip") are frequently found together in academic papers discussing the . Sak (Zac): The 11th month of the Haab' calendar. Zip (Sip): The 3rd month of the Haab' calendar.
The term appears in older telegraphic "phrase codes" (like Bentley's) where four-letter cyphers were used to transmit complex data. It is possible this is a niche technical archive from a site like Internet Archive .