Here you will find all the information you look for regarding the data sharing between Magento and the other apps of the marketplace

Interesting workflow you can accomplish with Magento on our MarketPlace

Data shared between Magento and other apps

Entity in Connec	Entity in Magento	From Magento to other apps	From other apps to Magento	See it on my Impac! Dashboard
Contacts				Invoice List widget (If invoice is attached)
Invoices				All invoice widgets
Leads				Leads funnel / Leads list widgets
Organizations				Invoice List widget (If invoice is attached)
Products				Growth per product widget (if sales behind product)

Entity in Connec	Entity in Magento	From Magento to other apps	From other apps to Magento	See it on my Impac! Dashboard
Accounts				Account balance / Accounts comparison widgets
Invoices				All invoice widgets
Bills				Purchase order list widget
Journals				Balance sheet widget (corresponding accounts are updated)
Opportunities				Opportunity funnel widget
Payments				Balance sheet widget (accounts receivables / accounts payables are updated)
Purchase order				Purchase order list widget
Sales order
Taxes

Entity in Connec	Entity in Magento	From Magento to other apps	From other apps to Magento	See it on my Impac! Dashboard
Employee				Employees list widget
Employee salary				Employees list widget
Pay item
Pay run
Pay schedule
Pay stub
Time sheet				Timesheets widget (only record the total time worked)
Time activity
Work locations

Entity in Connec	Entity in Magento	From Magento to other apps	From other apps to Magento	See it on my Impac! Dashboard
Tasks
Projects

All the apps available on Maestrano marketplace share data with Magento

However, these three apps are the best matching for Magento