There is a new entry into the desktop widget/customisation world and that goes by the name of PlexyDesk. PlexyDesk was originally an open source Ubuntu-based application designed to provide desktop widgets and multiple workspaces (desktops) on version 16.04 of that environment. PlexyDesk has been around for a while on Ubuntu but has recently grown in capability so that it now provides the identical desktop/widget functionality not only on Ubuntu but now Windows and Mac OSX.
The current version of Plexydesk is still beta but provides multiple desktops (workspaces), background image management and a default set of widgets which includes:
The product is new so we can't expect much at the moment, some bugs perhaps. It is also quite expensive which is strange given that the majority of apps these days cost no more than a couple of pounds/dollars. I would have expected Plexydesk to cost less than a fiver in order not to put off the casual purchaser, one or two dollars/pounds would make the software much more accessible and be more likely to bring the developers a steady stream of income. It makes not a lot of sense to price the software so high that very few will buy it. I expect the developers to see sense here soon, as they are currently cutting off a great deal of would-be users. PlexyDesk's main competitors are Xwidget, Rainmeter and the Yahoo Widget Engine all of which are entirely free.
At the moment the documentation is sparse, there is no designer GUI (which will put off the Xwidget community) and the price is high. I don't expect everyone to dive in and start using it immediately, given that it is in beta too. However, I would keep an eye out for it here at their website: plexydesk.org/
Read through the site, it is quite new and as a result it is choc-full of typos, grammar mistakes and chopped text but be positive and hope that it will all mature soon enough.
As you can see, some quite uninspiring widgets running on an Ubuntu desktop. Not the most graphically exciting of widgets in comparison to my own steampunk monstrosities but it shows the default set in operation.