In the order to do ITI, Diploma and B.Tech from distance education, you need to apply for the college you are interested and you have to fill the complete eligibility conditions for the particular university.

This is the list of top universities in India, offering distance education courses in India:

Indira Gandhi National Open University
Yashwantrao C. Maharashtra Open University
IMT Distance and Open Learning Institute
Sikkim Manipal University
Symbiosis Centre for Distance Learning
MP Bhoj (Open) University
Dr. BR Ambedkar Open University (BRAOU)
The ICFAI University Sikkim
Osmania University (PGRRCDE)
Alagappa University (DDE)
Shivaji University (CDE)
The ICFAI University Tripura
Netaji Subhas Open University
University of Mumbai (IDOL)
Maharishi Dayanand University (DDE)
University of Madras (IDE)
Andhra University (SDE)
Madurai Kamaraj University (DDE)
Vardhman Mahaveer Open University, Kota
Maulana Azad National Urdu University (DDE)
University of Delhi (SOL)
Annamalai University (DDE)
Dr. Babasaheb Ambedkar Open University
Karnataka State Open University
Acharya Nagarjuna University (CDE)
SNDT - Women's University (CDE)
Himachal Pradesh University (ICDEOL)
Tamil Nadu Open University
UP Rajarshi Tandon Open University
Uttarakhand Open University
Nalanda Open University
Kurukshetra University (DDE)
University of Calicut (SDE)
Patna University (DDE)
Kakatiya University (SDLCE)