One of the things that always seemed odd to me is the lack of non-evil summoning options in the Elder Scroll series. Warlocks and necromancers are set, but what about those of us that prefer not to dabble with dark powers? 

This mod adds twelvenine summoning spells for the tree-hugging hippie types that don't want to limit their conjurations to unholy packs with daedra and undead. 

Visit the wood elf druid named The Gray Witch not far from Anise's cabin (near Riverwood). She can train you in Conjuration up to level 100. She sells the following spell tomes: 

Frostbite Spider (min. level 5) 
Mudcrab (min level 5) 
Wolf (min level 5) 
Horse (min level 5) 
Horker (min level 5)
Skeever (min level 5)
Chewy (Dog) (min level 5)
White Stag (min level 10) 
Snowy Sabre Cat (min level 10) 
Snow Bear (min level 20) 
Mammoth (min level 30) 
Spriggan Priest (min level 30) 

All summonings last five minutes except as follows: Mammoth (2 minutes), Spriggan Priest (2 minutes), Horse (10 minutes and obviously serves as a player mount). 

All summonings level with the player. 

All summonings are slightly boosted for health and stamina. The Spiggan has been given Heal Other and will use it to heal you in combat. The horse's speed is slightly increased. 

All summonings have been added to the Player Ally and Player Friend Factions so they can be summoned in cities without any nasty repercussions. 

More powerful summonings do have higher casting requirements in terms of minimum skill level. 

While visiting the Gray Witch, feel free to use her various crafting stations. The Gray Witch's camp includes a player bed, small vegetable garden, tanning station, sharping station, woodblock, beehive, and alchemy table. Barrels and chest of various raw materials respawn, because the Gray Witch is not a lazy woman and hunts and forages to replenish her stores.