SqlSpec is a .NET app that requires a windows client box to run on. However you can still accomplish what you want.
SqlSpec is a client app and does not need to be installed on the server that is hosting your database. So what you need to do is this:
1. install SqlSpec on a windows box that has network access to your Unix server. 2. In the box for Oracle (on the "connections I" page) type connection string to your Unix server hosting Oracle. 3. click the "go" button.