Thanks so much for reviving the thread, it's needed.

Some potential updates;

Hashplex

https://hashplex.com - domain lookup failure, most associated links fail or not updated for 2 years.

https://www.crunchbase.com/organization/hashplex

Segmining

https://segmining.com - website is up, but thread discussion grew concerning 12/27/2017 and continuing till 09/22/2018.

https://bitcointalk.org/index.php?topic=814296.msg26724682#msg26724682

Coingeeks.io

https://coingeeks.io/closed - Marked as closed since 09/01/2018

Sinohash

https://sinohash.com - Website no longer works, user reports of scam starting 08/09/2017

https://bitcointalk.org/index.php?topic=1694162.msg20739592#msg20739592