Hello, my name is Christian Freeling and I've invented a couple of Go-related games that can be found at Sensei's Library.

Medusa - Lotus - Dominions
Medusa, Lotus and Dominions are ornamental variants quietly orbiting the outer edges of the Golar System. They all feature othelloanian capture and require either an exotic board or an exotic set of pieces. Only Dominions can be played turnbased, at mindsports.

Havannah
Havannah is not Go-related at all, but long ago someone thought otherwise and posted it at Sensei's, and since Hex is featured too, this is arguable. Little Golem is a good site to play Havannah online.

Symple
Symple not a Go variant but a thematic merger of 'territory' and 'dynamic connection', embracing the latter in favor of capture. It is the cradle of an innovative move protocol that subsequently found its way into Sygo. It can be played on a regular goban, though playing turnbased releases players of keeping track of moves and the count. The game is a joint effort of Benedikt Rosenau and me and the story of its discovery is well documented.

Sygo
Sygo's invention followed about a week after Symple's discovery, by applying the latter's move protocol to 'Go with othelloanian capture' and therewith implicitly (not to say surprisingly) solving the difficulties of getting eyespace, that characterize this non-cyclic form of capture. Sygo is free of cycles and fast and can be played turnbased at mindsports.

Acknowledgement
I stopped inventing games and wouldn't have bothered the Go community with the oldies, but Sygo and Symple are recent games and may be of interest to those who like to consider variants. Personally I find Symple more intruiging because of the strategical dilemma it's thematic blend provides. However, for Go players who are interested I would suggest to have a look at Sygo first and later decide if it provides any incentive to investigate Symple.
To make it easy I've posted a Sygo introductory game against Michael Stevenson and provided some comments.

christian

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cogito ergo erro

Very nice to see you and Mark on these Forums Christian.

For what it's worth, I'm a big fan of Havannah.