From the sands of time...
There were various M2 releases of the TFL map "Across the Gjol". You might try "Across the Gjol vIII" by The Wolf3, from 10 January 2004. The map features randomized waves. Always good.
http://tain.totalcodex.net/items/show/across-the-gjol-3
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There was an obscure release called "Gonen's Ridge" back in the days (December 1999). Basically Gonen's Bridge, modified so much as to be unrecognizable. The units were all vanilla Bungie, if I recall. Insane challenge. Sadly, it's not in the archives.
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"Lugas - The Abomination" was kinda fun.
http://tain.totalcodex.net/items/show/l ... bomination
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"Sir Mauriac's Tale" was already mentioned, but that's TFL only, unless something's changed in the last few years. Definitely one of the best 3rd party solos for the Myth series, ever.
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There's "Mud River Market Defence"---again by The Wolf3---based on one of the coolest colormaps of all, "Mud River Market" (by Amos & Angus of the Creation group). Same map was used for a Wild West scenario, FYI.
http://tain.totalcodex.net/items/show/m ... defence-b8
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"Muirthemne Penitentiary" is a great one, by Snakebelly of Muirthemne Militia. A definite fav.
http://tain.totalcodex.net/items/show/m ... nitentiary
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You might also try "Path of the Damned".
http://tain.totalcodex.net/items/show/p ... the-damned
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"Senex Silvae" is pretty great, but different. You start with a single unit.
http://tain.totalcodex.net/items/show/senex-silvae
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For somewhat silly but interesting challenge, try "Shade". The maps are kinda crude, but gameplay is good.
http://tain.totalcodex.net/items/show/myth2-shade
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The plugin "Sosua Beach" was a goodie, but I don't see it here. Was made by Chuck Sievert (aka Webscreamer; aka iScream) and Harlan Lewis (aka Blambi), back in July 2001.
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Both versions of "The Fall of Naugrimin" are pretty insane.
http://tain.totalcodex.net/items/show/t ... -naugrimin
http://tain.totalcodex.net/items/show/t ... augrimin-3
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"The Great Journey"---by DarthRevan555---is a semi-classic. A bit redundant here and there, but definitely a keeper.
http://tain.totalcodex.net/items/show/t ... remastered
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"Throne of the Lich King". At times a pain, but overall a very decent solo.
http://tain.totalcodex.net/items/show/t ... -lich-king
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"Aztec Oranges" is so very cool, but also so preposterously hard to the point of being well beyond annoying. A shame, really. However, if you are indeed crazy, and love micromanaging your micromanagement, it might be for you. On the other hand, I don't see it here, so...
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Check out "Brave the Ghenjiwash" by the fabulous GimpMask. Definitely a tough one.
http://tain.totalcodex.net/items/show/b ... ghenjiwash
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Though it does have a few modified units, "Attack on the Great Hall" is a lovely challenge, indeed. No idea who made it.
http://tain.totalcodex.net/items/show/a ... great-hall
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There are of course many more maps and plugins out there. Just a few off the top of my head, this lazy day.
Cheers.