I’m not sure if this as been posted before, but I found this by chance.
http://cymraeg.gov.wales/?lang=cy
http://cymraeg.gov.wales/?lang=en
Welcome to a new bilingual website to support and promote the use of the Welsh language, created by the Welsh Government.
This site is an information platform that will also lead people on to other sites which offer useful Welsh language services, information, activities and news.
The main aim of the website is to support people to use more Welsh in their everyday life - as confident Welsh speakers, learners or non-Welsh speaking parents. It also introduces the language in all aspects of life to those who cannot speak Welsh and encourages them to learn more about it. We hope you’ll find it useful.
Apart from anything else, it has a long list of Welsh/Welsh-oriented apps.