Moss Grid
Many years ago - about a decade I think - I hosted a region or two on OSGrid, an Opensimulator test grid. Opensimulator is an open source version of SecondLife's region server software, allowing you to host your own regions and even your own grids. Standalone regions and grids can be connected via the hypergrid, allowing your avatar to teleport to regions in other grids as easily as it can teleport between regions in your own setup.
Opensimulator has come a long way since I toyed with it back then. I now host two regions on OSGrid, and have my own micro-grid hosting a region - currently just the one but easily expandable. The image shows my avatar standing in the corner of my region of my grid. The avatar skin and clothing came from OSGrid, showing how easy it is to go shopping in other grids.
The regions in OSGrid were easy to setup, but the micro-grid was problematic. Thanks to some great support from people at OSGrid I got it working. The reason it had failed initially is because I mis-interpreted instructions, so entirely my own fault.
Barrow
The name of my grid is The Island if Moss. Don't ask why, it's a long story that's not worth telling here. My region is called Barrow - a Lord of the Rings reference - and is a so-called var-region. In Second Life, regions are 256m by 256m. In Opensimulator they don't have to be. Barrow is 1km by 1km. That puts a bit of a strain on the server, but it should cope for the most part until avatars start to visit. Avatars want to know the state of the world so their viewer can render it properly, and since the world is dynamic and things can move around - everything can move around - that requires a lot of server updates and asset server downloads. I want to know how far I can take this.
My health is on a downward trend, and I'm spending more and more time at home and able to do less and less. This is a long-term project that will evolve over time, and I hope to post some more snapshots of the world as it develops.