Also, this concentrates on the English Speaking world becasue that's all I speak
(Almost nine and half thousand G+ followers.)
(Not that big on G+ but has his own forum.)
(Nearly 5 and half thousand G+ followers.)
(Almost 4,000 G+ followers)
The Old Guys
Courtney Campbell - still runs 'Hack and Slash' which had a big impact on the culture. Is still posting but at a reduced volume. Courtney, if you want me to move you out of the 'Old Guys' then let me know.
James Maliszewski - ran Grognardia, a fundamental OSR blog, currently doing a Tekumel fanzine.
Jeff Rients - ran a central gaming blog, recently released Broodmother Sky Fortress through LotFP.
Justin Alexander - from the Alexandrian blog has a following I know nothing about. (Checks,.. holy shit his Patreon gets $108.00 per post.)
See Stuart Whites comment below for a list of other important influences.
Drangonsfoot - A forum of the true old Gygaxian Grognards. Had a big influence on the early OSR and still chugging along. Total membership is just over 10,000.
(Described as; "Dragonsfoot is focused on first edition AD&D. The posters seem primarily to have grown up playing that game, many look to have never stopped. There is a strong love of Gygax here, who was a regular poster on the forum until his death. (I would say the forum has an overt anti-Arneson vibe.) Other TSR luminaries post here as well. The forum has produced a lot of 1e modules and other resources.")
odd74 - I know very little about these guys, they seem similar to Dragonsfoot to me. Currently at just over 2000 members.
(Described as; "ODD74 is the forum centred around Original D&D (the "little brown books"). Many posters look to have been playing in the 70s and discovered the original game at that time. Most posters also look to have never really stopped playing old school D&D. Mike Mornard, who was one of Gygax's original players, posts their regularly. The forum is fairly active and congenial. It has official sub forums for some OD&D related projects, notably Carcosa.
Also described as 'chill, drama free, dull and specialised')
In the comments below Settembrini goes into the deep history of 0dd74 and the links between it and later bloggers like James Mal.
Knights-n-Knaves - Similar to the above, currently at just over 1000 total members.
rpg.net - almost all of the people that I personally know, don't use rpg.net or use it minimally. It's almost a defining element for my immediate social circle and even many of the Big Personalities above who hate each other can still agree that they hate rpg.net more. I know Kevin Crawford is still on there a bit.
Lamentations Of The Flame Princess
North Wind AdventuresPublishers of Astonishing Swordsmen and Sorcerers of Hyperborea. These guys do print runs and they have been nominated for a few Ennies.
Basic Fantasy Group
New Big DragonI know very little about these guys but the comments say they do their own print runs and their biggest seller on RPG.NOW is a gold pick so they must be doing something right.
AutarchThe publishers of Adventurer Conqueror King and Dwimmermount. The owners are connected to the Escapist website, which also first ran the D&D with Porn Stars web series.
See Christopher Richardsons comment below for a deeper look into this.