Hi Adeel,
Not all tables in GP though can give you this information though.
On top of my head for SOP, you can check the SOP10100 and SOP30200 for the PTDUSRID (user who posted) and POSTEDDT (posted date), USER2ENT (User who entered), CREATDDT (Created Date), MODIFDT (Modified Date) columns.
I believe other modules have these columns as well - but not all.