Yes, get Oracle SQL Developer (free, but you may need a free Oracle login to download)
You can use the latest one for Oracle 12c, or 11g.
You might need to download and install Java JDK 8 first:
Also, you might need the Oracle ''SID'' for your Oracle instance (usually the same as the server name.)
In SQLDeveloper, you can setup ''connections'' -- one for each ''schema'' you want to work with, for instance:
''qcsiteadmin_db'' is an Oracle Schema and an Oracle User at the same time.
The ALM Demo project in the Default domain might have the schema/user name of:
Usually, all you need to do is check to see if you know a password and that it still works.
here is an example of a SQLDeveloper connection.
We know the IP address of the ORACLE server and the SID. We are trying to connect to qcsiteadmin_db and know the password.
We fill in the values and click TEST. If we see ''success'' for the status, we are correct.
Often, this is all we need to do to confirm connectivity.
From here, we can examine the various tables and rows of data in the Schema.
You might be able to alter/modify/delete critical data, do not do so unless you know what you are doing.