That's a great question; I suspect that there are quite a few pretty big $ software firms doing vertical market software enterprise apps for specific types of e

That's a great question; I suspect that there are quite a few pretty big $ software firms doing vertical market software enterprise apps for specific types of enterprises/entities with unusual requirements who are happy that few know how successful they may be. Are there dominant software providers for any of the following (bigger than mom-and-pop businesses, with many organizations in the industry): 1. Large construction projects 2. Paper mills 3. Motion picture production 4. Oil and gas drilling 5. Cattle ranches 6. Local property tax assessment and collection 7. Traffic ticket and traffic court management 8. Water works and/or Sewer plant management 9. Prison management 10. Automobile junkyards 11. Parking lots and parking structures 12. Independent bookstores 13. Rental property management 14. Exercise clubs 15. School districts 16. Churches ??? Somebody spill the beans, please.