Which of the following are built on top of open-source digital platforms? DigiLocker? DIKSHA? [2022]

Consider the following:

Open-source digital platforms are software platforms whose source code is made publicly available for anyone to view, modify, and distribute. Unlike proprietary software, where the code is kept secret and controlled by the developer or company, open-source platforms encourage community collaboration and transparency. Free and Open-Source Software (FOSS) presents an alternative model for building digital technologies at a population scale. It results in many benefits, reduced costs, no vendor lock-in, the ability to customise for local context, and greater innovation through wider collaboration.
Several public services, including Aadhaar, GSTN, DigiLocker, Diksha, Aarogya Setu, and the Covid-19 vaccination platform CoWIN, are built upon open-source digital platforms.

The DigiLocker platform, launched in 2015, is a flagship initiative of the Ministry of Electronics & IT (MeitY) under the Digital India programme. It operates as an app to store users’ digital records.
It is a cloud-based platform designed to store citizens’ digital documents.
The stored documents can also be shared and verified through DigiLocker.

Developed by: Ministry of Electronics and Information Technology
It is a mobile application developed to connect essential health services with the people of India in our combined fight against COVID-19.
The App is aimed at augmenting the initiatives of the Government of India, particularly the Department of Health, in proactively reaching out to and informing the users of the app regarding risks, best practices and relevant advisories pertaining to the containment of COVID-19.

COVID Vaccine Intelligence Network (CoWIN) system is a comprehensive cloud-based IT solution for planning, implementation, monitoring, and evaluation of COVID-19 vaccination in India.
It provide real time information of vaccine stocks, their storage temperature and individualized tracking of beneficiaries of the COVID-19 vaccine.
This platform will assist the program managers across all levels through automated session allocation for pre-registered beneficiaries, their verification and for generating a digital certificate upon successful completion of the vaccine schedule.

DIKSHA (Digital Infrastructure for Knowledge Sharing) is a national platform for school education, an initiative of National Council for Educational Research and Training (NCERT), under the aegis of the Ministry of Education (MoE), GoI. Launched in 2017.
The platform is founded on core principles such as open architecture, open access, open licensing, and emphasizes choice and autonomy.
Built on open-source technology developed in India, it integrates internet-scale technologies and supports diverse use cases and solutions for teaching and learning tailored to the needs of Indian education.