Applications/Registrations Tools/SIS: What are you using?

Hi everyone,   I am writing to this group, and I would like to get a better sense around what other schools/universities are using around Applications/Registrations forms and SIS?

• Are you using the Salesforce native tool HEDA (with addition of Admissions connect, Alumni, Student Experience etc) ? 
• Are you using any other tools (ie. no Salesforce), and building your Admissions process and Payment processors as integrations into Salesforce? (and customised Salesforce to handle your processes)?

Any intel or additional info would be really appreciated! 

Thanks a lot.