Oh I guess I'm late to this thread.
Last Game. I fricken love last game. Every time I read a new chapter I just become a little girl inside. idk I just reaalllyy like it. It's really cute and really sweet and my favorite shoujo manga.
Koe no Katachi. I'm surprised no one mentioned this (I think). The one shot is fricken amazing. It's ~60 pages so I highly recommend you read it. The normal manga is also pretty good.
Orange. I just read it a few days ago and it was really good. I think people already talked about it so I won't say anything more.
The Friendly Winter. It's a really cute manhwa featuring a girl who has a growth disorder and a guy who has a mental disorder. That's all I'll say about it.
Assassination Classroom. Again, already mentioned. It's almost ended and at this point I already know it's going to be one of my favorites.
Hibiki no Mahou. There's kinda an entire thread about it so I don't need to say anything.
Honorable mentions (many of which are because they aren't finished):
Real Account. It's one of those psychological "stuck in a game" type things but its not an mmo this time yay. It hasnt had consistent releases though.
Relife. This might be moved to favorites. I really like the everything. It has consistent updates and I like the romance and stuff.
Tate no Yuusha no Nariagari. I originally read the manga but I wanted more so I read the original Web novel as well. Apparently the light novel is in publication and the manga is based on the new light novel and not the web novel so I'm reading to see where the story branches off and stuff.
Nukoduke. Hngghh what the hell even is this? It's like a cute SoL thing that isn't about cute girls doing cute things but it's still cute. It's really light hearted and stuff idk what else to say.
Saki. I do not recommend because I assume that most people on an English speaking forum wouldn't care about mahjong. I like it because I like mahjong and find the manga really excited with RINSHAN KAIHOU and all that. There's also the hinted yuri ship which is great.