My Lazy Afternoon
http://mylazyafternoonsgame.wordpress.com/This one looks to be the most active and the furthest along, with a promising demo available for download. Pretty classic Harvest Moon fare—you'll be farming, raising animals, completing quests, and interacting with a handful of happy villagers. The designer doesn't seem too sure the project will ever be completed, but it's still fun to see such a polished take on the genre.
Tailor Tales
http://tailortales.wordpress.com/Although it's currently on hiatus, this game deserves special mention for its fresh concept and original artwork, as well as for being a big inspiration behind World's Dawn. Celianna is a terrific artist and a valuable member of the RPG Maker community, and she has legions of fans waiting to see what's in store for this promising project.
Serenity Oceans
http://forums.rpgmakerweb.com/index.php?/topic/7992-serenity-oceans/A very unique project that blends farming gameplay with a dark fantasy story weaving throughout. Still very early in development, but it's certainly worth keeping an eye on. The character artwork—commissioned from a talented deviantArtist—looks fantastic and the world looks to be very well thought-out.
Stardew Valley
http://stardewvalley.net/While this doesn't qualify as an RM title, it's definitely in a similar vein and a wonderfully exciting project. It harkens back to early Harvest Moon games with its traditional country-life feel, but at the same time offers innovative new features like 4-player co-op. No release date as of yet, but the developer is good about posting regular updates.
Are you working on a Harvest Moon-inspired game or do you of any others you're excited about? Let me know and I'd be happy to feature it in another post.