I must admit that to me ViewSonic do monitors. It turns out that back in 2013 they were also doing thin clients, one model of which popped up on eBay in January 2019.
ViewSonic's web site initially denied all knowledge of any thin clients - returning 404's from all the hits on Google. Their search function also failed to turn up anything but I persevered and, having navigated to https://www.ViewSonic.com/uk/products/archive/ scrolled down past the all the monitors and projectors to find mention of four:
SC-T35 Education and Small- Medium- Enterprises
TI DM8148 ARM (1GHz), 512MB flash, 1GB RAM.
Intel Atom N2800 Dual Core (1.87GHz), 4GB flash, 2GB RAM.
SC-T46 Thin Client
Intel Baytrail Quad-core N2930, 8GB flash, 2GB RAM.
SC-T47 Thin Client
Intel Baytrail Quad-core J1900, 8GB flash, 4GB RAM.
Of these I have seen the the SC-T45.
Any comments? email me. Added January 2019