These are creatures created for campaigns, adventures, or for your personal use.
Note that in each of our creatures there are sections that apply to 2E and to 3E. THAC0 is for 2E while Challenge Rating is for 3E. Other statistics like hitpoints or armor class are labeled with a 2E or 3E to show which it represents. Only the base is shown on statistics, modifiers should be added after the base.