As I’ve seen there’s somewhat of a demand of conlang resources here on tumblr and I haven’t really seen that many masterposts, here’s the resources I mainly use to look up information for my conlang and such:
The Language Construction Kit (LCK): Good for anyone starting, Mark Rosenfelder saves our asses in English, German, Portuguese and Italian.
r/Conlangs Reddit once again bein’ at it , having a 10k follower based subreddit, all for conlangs.
The Language Creation Society (LCS), the webpage everybody should look up once in a while to know what’s happening in the conlang world. They even have their own resources page http://conlang.org/resources/
Follow @dedalvs (David J. Peterson) on tumblr, http://dedalvs.conlang.org/ and http://www.dothraki.com/ on the web and David Peterson on youtube. He also wrote a book! Called The Art of Language Invention. I haven’t had the chance to get my hands on it (shame on me) but I’ve heard it’s pretty good.
Follow @christophoronomicon (Christophe Grandsire-Koevoets, who’s also the president of the LCS, *whaaaaaaaat?*) on tumblr and http://christophoronomicon.blogspot.com.es/ on the web
WALS has a lot of information and, especially, STATISTICS about real languages. Pretty handy.
UniLang is a multi-language forum. They are always useful.
Ethnologue is like... The encyclopaedia of languages? Idk but it’s pretty rad. It has information about... Well... Pretty much all languages in the world.
Conlangery: Podcasts about conlanging. They are nice people.
ConWorkShop: Pretty nice portal with lots and lots of conlangs. It lets you creat a dictionary and grammar tables, gives you texts to translate, asks you the difficult questions (wtf idk if the noun-relative clause order is double headed, adjoined or correlative. Don’t look at me!) and many other tools.
Linguistics portal, Language portal, Conlang portal. Wikipedia will be your best friend. I mean this literally. Sometimes you'll just need to know the difference between the passive and the antipassive voice or some other random linguistic fact. Don’t forget to do your research or you’ll miss out on many fun features.
Here’s a good list of linguistic/conlang youtubers. Here’s another one. I particularly like Xidnaf, Artifexian, Langfocus and Tom Scott. I also follow Ben DuMonde, who is not on those lists.
Look up both natlang and conlang grammar books. For the natlangs you can check this google drive (from @ingenjor) and for the conlangs you’ll probably have to look them up on Wikipedia and build up from there. Remember: the best inspiration comes from reality.
In case you don’t know many conlangs to look into here’s a small list of the ones I believe are the most notorious/interesting: Loglan, Lojban, Esperanto, Ido, Volapük, toki pona, Solresol, Latino sine flexione, aUI, Ithkuil, Láadan, Quenya, Sindarin, Na’vi, Dothraki, High Valyrian, Klingon, Vulcan and many, many maaaaaany more. Check this out.
