MANY.  Here is a list and link to a lot of them.

FHFA (“FEDERAL HOUSING FINANCE AGENCY”) STREAMLINED MODIFICATION

http://www.fhfa.gov/webfiles/25068/StreamlinedModInit32713Final.pdf

STREAMLINED MODIFICATION (FANNIE MAE GSE)

https://www.fanniemae.com/content/announcement/svc1305.pdf

STREAMLINED MODIFICATION (FREDDIE MAC GSE)

http://www.freddiemac.com/singlefamily/service/streamlined_modification.html

FEDERAL MHA (“MAKING HOME AFFORDABLE”) OPTIONS – ALL

http://www.makinghomeaffordable.gov/programs/view-all-programs/Pages/default.asp

HAMP TIER 1 (NON GSE)

https://www.hmpadmin.com/portal/learningcenter/docs/presentations/mhaservicerwebinar_stdaltwtrfall_presentation.pdf

HAMP TIER 2 (NON GSE)

https://www.hmpadmin.com//portal/learningcenter/docs/presentations/mhaservicerwebinar_HAMP1_presentation.pdf

HAMP PRA (PRINCIPLE REDUCTION ALTERNATIVE)

http://www.makinghomeaffordable.gov/programs/lower-payments/Pages/pra.aspx

HAMP (NONGSE) 2MP (2ND LIEN MODIFICATION PROGRAM)

http://www.makinghomeaffordable.gov/programs/second-mortgage-help/Pages/default.aspx

 HAMP (FANNIE MAE GSE)

https://www.fanniemae.com/content/faq/home-affordable-modification-program-faqs.pdf  (Note: No Tier 2)

HAMP (FREDDIE MAC GSE)

http://www.freddiemac.com/singlefamily/service/mha_modification.html  (Note: No Tier 2)

FHA-HUD HAMP

http://portal.hud.gov/hudportal/HUD?src=/hudprograms/fhahamp

http://www.makinghomeaffordable.gov/programs/lower-payments/Pages/fha-hamp.aspx

FHA-HAMP  SECOND LIEN PROGRAM (FHA2LP)

http://www.makinghomeaffordable.gov/programs/lower-rates/Pages/fha2lp.aspx

VA HAMP

http://www.makinghomeaffordable.gov/programs/lower-payments/Pages/va-hmp.aspx

USDA HAMP

http://www.makinghomeaffordable.gov/programs/lower-payments/Pages/rd-hamp.aspx

HAUP (HOME AFFORDABLE UNEMPLOYMENT PROGRAM)

http://www.makinghomeaffordable.gov/programs/unemployed-help/Pages/up.aspx

“IN HOUSE” MODIFICATIONS

These are modifications offered by individual entities.   You have to ask them for information on their particular program.   Many mimic the HAMP program.