Mostly Oracle (and old stuff at that; OWB/Disco rather than ODI/OBIEE), some Cognos and Informatica, more recently smatterings of MS and SAS (back to good-ole DATA STEP, PROC this-and-that, where I began my "career"[*] twenty-odd years ago). Oh, and I took a course in IBM Data Manager once; too bad I never got the opportunity to use it for real, because it was quite interesting from a technical viewpoint.
But I assume Business Objects's ETL tool-thingy is at least superficially like all the others; all the others certainly are at least superficially all pretty much like each other[+]... So, the height of arrogance: If you want to know something about how it works in practical use, I'll try to answer anyway. Ask away! :-)
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[*]: To use a hugely over-grand term; I'm not sure what exactly makes one's succession of jobs a "career", but it sure don't feel like I've got that. Some people have careers, I have a job. When I do.
[+]: Except perhaps for the aforementioned IBM Data Manager, which differed from the pack in one major technical aspect.