The Lingk platform is often used to integrate a myriad of data sources to existing Salesforce systems. Many of these use cases are well documented in our recipe library.
Below are a few handpicked recipe examples that may be relevant to your use case.
SIS to Salesforce
Ellucian to SFLinkCanvas to SFLinkBlackboard to SFLink
On Premise to SF
On Premise to SFLink
Flat Files and Salesforce
Salesforce ReportsLinkUpsert Excel Data Into ContactsLinkSFTP to SFLink