Ganapathy Sachchidananda

https://en.wikipedia.org/wiki/Ganapathi_Sachchidananda
https://en.wikiquote.org/wiki/Ganapathy_Sachchidananda_Swamiji

Sites

1. https://www.dattapeetham.org/
2. http://www.dycuk.com/
3. https://dattadigambara.com/

Hanuman 

1. http://dattaanjaneya.org
2. https://www.dallashanumanstore.org/

Puttu

https://puttugam.com/

Birds

http://sgsbirds.com/

Directory

http://www.sgslinks.com/

Tube

https://www.youtube.com/results?q=Ganapati+Sachchidananda

Death

sripadavallabha

http://sripada.co/
http://sripadavallabha.org

http://sreepadasreevallabhapithapuram.in/
http://sripadavallabhamiracles.com/

http://www.sripadasrivallabhamahasamsthanam.com
https://trinitygods.blogspot.com/search/label/Pithapuram

Sai

In the age of Kali, the first incarnation of Dattatreya happened in 13th century in place called Peetikapuram (Pithapur), Andhra Pradesh, under the name of Shripad Shri Vallabha. This was followed by a second incarnation - Narasimha Saraswati, Gangapur, Karnataka and then by Shri Swami Samarth in Maharashtra. These three forms were poorna-avatars of Dattatreya in Kali yuga. These were followed by amsa-avatars Vasudevanand Saraswati, Manik Prabhu, Gajanan Maharaj, etc. 

The hagiography of Shripada Srivallabha was written in 13th century. The book has in it the details about the upcoming avatars of the ensuing centuries. Here is an excerpt from the same :

Sripada Srivallabha visited one of the caves of Badrinath, where Hanuman was then residing (i.e 13th century) and gave him darshan. Speaking to Hanuman, the lord said, "Hanuman, you have been chanting the Rama mantra even during the time of deluge. Chitragupta is finding it difficult to keep record of the number of times you have chanted the Rama nama. You are indeed a Kaalaateeta (beyond time). It is my will that for the benefit of people in Kaliyuga, you incarnate with your potency and guide mankind in the form of a sadguru. All the while, you have worshiped me in the form of Janaki Vallabha. In this incarnation, you adore me as Shiva-Shakti by uttering the name of Allah which is acceptable to the Mlecchas."

Hanuman replied thus, "Swami, From the perspective of body, I am your servant. From the perspective of jeeva, I am a part of you. From the perspective of soul, you and I are One. After the end of an avatar, the amsa merges in its moola tattva. In order to be inseparable from you, I wish that after the end of this incarnation, the amsa must merge into your ancient moola tattva. I do not wish to be separate from you. For, am I not your child?"

The lord replied, "My dear Hanuman. You are very intelligent. May all my strength and supremacy shine in you. I will incarnate as Narasimha Saraswathi in the future century and stay incognito for 300 years peforming penance in Kadalivana, following which I would take the form of Swami Samartha in Pragnapura. When the time comes to leave the mortal frame of Swami Samartha, I would enter into you who are the form of Sai and unequivocally announce that my incarnation is within you. You will become famous as my Sarva samardha sadguru incarnation under the same Bharadvaja lineage of mine. I am also conferring the title of Natha to you and henceforth you will be called Sainatha." 

Hanuma replied, "I will try to coordinate the good things in mleccha religion and the good things in the ancient dharma. There must be a mleccha guru also." For that the lord said, "A great gyani named Mahboob Subhani is in me. I will have him incarnate as Varish Alishah. He will be your guru and teach you secrets of yoga in that incarnation. Shyam charan will teach Kriya yoga."

The excerpt goes onto discuss various other intricate details about the avatar and the interesting conversation between Hanuman and Lord Dattatreya in the caves of Badri, in the 13th century. One may read the mentioned hagiography of Dattareya's first avatar, Sripada Srivallabha Charitamritham to get to know about these details.

http://saidattanj.org
http://saidattatreya.com/
https://www.quora.com/Who-was-Shirdi-Sai-What-was-his-aim-ideology-What-draws-you-back-from-worshiping-him-as-a-God