Running ./runInstaller and selecting the "Software Only" or "Create and Configure Database" option.
Oracle Database 11g Release 2 (11.2.0.4): The Final Frontier of 11g oracle database 11g release 2 11.2 0.4 download
You will need an Oracle account. If you do not have one, registration is free. Once logged in, you will be taken to the "License and Export Restrictions" page—accept the terms. Running