We have been using Oracle GoldenGate (OGG) for our replication needs. We have a mix of database environments including Oracle, DB2 and Microsoft SQL Server. We use Oracle GoldenGate to replicate across the mix of these different RDBMS. OGG is reliable, fast, has high throughput and allows heterogeneous replication.
We also use OGG Management Pack which is an extra license cost and includes Oracle GoldenGate Monitor, Oracle GoldenGate Director and Oracle GoldenGate Veridata.