Here's a quick look. It's pretty simple and useful for anyone like me who enjoys lots of different maps. Shame there isn't a scroll bar!
Download: https://github.com/Auios/Multiwinia-Map-Manager/releases
Installation instructions included.
To install just run it from the same directory as Multiwinia.exe
This is open source so if you have any suggestions or bugs to file please send them to https://github.com/Auios/Multiwinia-Map-Manager/issues
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Btw check out our Multiwinia Discord community!
http://multiwiniahub.com/discord.php