GoldenGate can be used for Standard Edition as well as stated in the "Oracle® GoldenGate Licensing Information Release 10. E15889-04 July 2010”:
“The license for Oracle GoldenGate includes the ability to capture database transactions from Oracle Database and deliver database transactions to Oracle Database. It also includes a full use license for Oracle Active Data Guard, and a full use license for XStream. Note that the capture and deliver features of Oracle GoldenGate work with any edition of the Oracle Database, while Active Data Guard and XStream require Oracle Database Enterprise Edition."
On the other Hand you can use SharePlex from DELL Software or Dbvisit Replicate. Both products are similar to GoldenGate (where SharePlex is like the father of all those products) and offer real time replication.