Replication of on premise Oracle to Oracle RDS

When Oracle databases are moved from on premise environments to AWS Oracle RDS, there may still be existing on premise Oracle (and non-Oracle) databases that need to replicate data to Oracle RDS. Options such as Oracle GoldenGate and Oracle Streams can be used.  There are also some other options: 

SymmetricDS is open source software : http://www.symmetricds.org
DBVisit : http://www.dbvisit.com/solutions/data_distribution/
Shareplex : http://www.quest.com/shareplex-for-oracle/
Pervasive : http://integration.pervasive.com/Integration-Scenarios/Data-Migration-ETL.aspx