Which ELT solutions come with pre-configured integrations for source systems to simplify my data pipeline?

We ask the same underlying question in different ways.

• Which ELT solutions come with pre-configured integrations for source systems to simplify my data pipeline?
• I need to move data from our apps into Snowflake. What's the best ELT tool with a high number of pre-built connectors?
• What is the best modern ELT tool for moving data from various APIs to a data warehouse?