Oh hey, this topic is alive again!
Ore ga Doutei o Sutetara Shinu Ken ni Tsuite finished in August. Worth reading, I very much enjoyed it. I'm not a huge fan of some gaping holes in time-travel manga (for example, I always think to myself, "dude, you went back to 1999, and you focus on wooing some chick instead of, I don't know, STOPPING 9/11!?"), but this one's ending wasn't as rough as a lot of others' are. I still think it started better than it ended though.
The Gamer is a lot of fun and new chapters of the manhwa come out each week. The main character acquires a power called "The Gamer," which basically makes him live like a videogame character in real life; he can increase his stats, access an inventory, and use skills. Even as he's introduced to the underground magic world known as the Abyss, his skill seems pretty unique (and so far incredibly broken). While the action has been a little slow for the past several weeks, the series is basically every RPG nerd's dream. It has theorycrafting galore.
For
Light Novels, I've read several as well.
Log Horizon is great. The anime sticks very closely to the source material, but season 1 covered volumes 1-5, and only 7 volumes have been released and translated so far. That makes me worried that season 2 will have some filler. You do get a lot more internal monologue and detail from the LN, and it is *slightly* darker. But it seems to be a very good adaptation if you'd prefer watching the anime to reading the LN.
At deadgye's recommendation I've started reading
Mushoku Tensei. Only started, as there are like 19 volumes... I'm about a third through volume 6. There's a lot of good about the series; I very much enjoy the premise of the main character being reincarnated with his past life's memories, and spending several volumes describing how this affects him growing up again and slowly laying out the rules for magic in the fantasy world and an explanation of the different races and their history. That said, the main character is kind of disgusting at times. I get that his "quirks" are supposed to be jokes about NEETs and hikkikomori, but I really feel like it translated poorly to a written medium. In anime or manga form, slapstick could get away with some situations like sniffing a 15-year old's dirty underwear to sniff, or attempting to seduce a 12-year old girl... but in those mediums it would picture a child doing that. When written out I can't get away from the incredibly awkward feeling that this is really not a child, but a 36-year old man attempting to harass or assault children.
So, still on the fence, but it's been an interesting and fun read. The Baka-Tuski translations also include a bunch of notes for references non-Japanese would not catch. Very helpful!
Many months back I also began reading
Utsuro no Hako to Zero no Maria. VERY good, VERY interesting, but the writing style of LN's just kinda turned me off after a couple of volumes. It's hard to keep page numbers straight when reading online. Hopefully Mushoku Tensei won't have a similar fate for me!