Informatica has shifted heavily toward cloud services in recent years. They offer a of Informatica Intelligent Cloud Services (IICS).
If you cannot get a legitimate free license for Informatica but want to learn the concepts (ETL, Data Warehousing, Mapping), you should look at the . These tools are completely free to download and use, and the skills are highly transferable to Informatica.
Informatica PowerCenter is the legacy on-premise ETL tool. Finding a "free" version of this is difficult because the edition has been officially discontinued.