Hubspot
Hubspot is often referenced as the best startup CRM software that also runs on an open source framework, as this type of platform facilitates many unique features that other programs don't. Store a virtually unlimited number of customers' contact information, with Hubspot allowing up to a whopping 1,000,000, none of which ever expire unless they're manually deleted from Hubspot's interface. Employees have no worries in keeping up with the most important leads and follow ups, as Hubspot creates a list of which customers and interested first-time consumers should be reached out to before any others, as wasting too much time isn't at all conducive to converting these patrons into paid transactions. All recent sales activity is shown within Hubspot's interface, of which all applications can be minimized, blown up to cover the entire display, or their individual sizes adjusted to fit certain applications. As the best startup CRM software around, implement Hubspot and experience a dramatic skyrocket in productivity.