AWS Direct Connect provides a secure network connection for transferring large data sets, reducing bandwidth costs, while Kinesis Data Firehose collects and transmits streaming data in real time. These tools enhance S3 features but also impact the end bill. Direct Connect's pricing depends on the connection type and data transferred out, while Kinesis Data Firehose's pricing is based on the quantity and type of data. Understanding these tools and their pricing structure can help businesses make informed decisions on their usage.