German Resources

Grammar:

Animated German Grammar: Animated German grammar tutorials.
Conjuguemos: Interactive quizzes that can be custom timed, provide correct answers, and focus on speed. There are quizzes for grammar, vocabulary from German text book chapters and vocabulary organized by themes. Links to vocab lists and flashcards provided as well.
Deutsch im Blick: Grammar references (Deutsch im Blick has limited explicit grammar modeling, but it is supported by an extensive companion online resource.
Deutschkurs: Deutschkurs has extensive online chapters covering beginner to advanced German grammar. It also includes dialect information on how German is pronounced in various regions of Germany.
German language learning games: Digital Dialects: Divided into different basic lessons that provide and written and pronunciation review before allowing you to play games to practice basic German vocab
German Tutorial Index: Comprehensive, grammar, and vocabulary review of German
Grimm Grammar: Grimm Grammar is an online German grammar reference from the University of Texas at Austin.
Learn German: A site for German students, teachers, and German enthusiasts.
Nancy Thuleen: Grammar worksheets for teaching German
Verbix: German Verb Conjugation

Vocabulary & Flashcards:

Cram: A flashcard website. You can choose to include images on flashcards and choose from a many links providing vocabulary lists. Useful for studying grammar and conjugations as well. Once you go through the flashcards, there are tests, memorizing exercises and games as well.
German language learning games: Vocabulary and grammar building games for all levels.
German Phrases: Common German phrases (with audio and game)
Quizlet: German vocabulary flashcards
Slow German: This is a side project of Annik Rubens who produces the podcast Sleepless in Munich. The topics of her Slow German podcasts include everything from holidays to automobiles. The podcasts and transcripts are free. For an additional fee you can purchase the accompanying materials in PDF format, which include vocabulary, comprehension questions, and a cloze exercise.
The German Professor: German language lessons, culture lessons, quizzes and other resources.
Vokabel: German vocabulary pop quiz, and other exercises

Culture:

Goethe-Institut: The Goethe-Institut fosters knowledge about Germany by providing information on German culture, society and politics. This includes the exchange of films, music, theatre, and literature.
Easy languages– Easy German (YouTube): Easy German is a YouTube channel that focuses on the lives of everyday German citizens in Germany. The videos are conducted in German with English and German subtitles. The videos start off with a question that the filming crew wants to ask Germans and then they record their responses and dialogues. Topics range from anywhere between “would you rather…” and “what do Germans like about other countries.”

Dictionary:

DWDS − Digitales Wörterbuch der deutschen Sprache: Very easy to use, with concise definitions in German that are easy for intermediate-level students, plus synonyms, etymology, and historical usage, all at a quick glimpse.
Beolingus: Online dictionary that provides students with examples of word usage and synonyms.
CanooNet: German dictionaries and grammar" is an English-language site offering practical helps with German.
Dict.cc: Besides browsing the dictionary or searching for German-English translations you can also ask and answer questions related to the German or English language using the translation forum. To improve your language skills try the vocabulary trainer
Leo Dictionary: Two-way German-English dictionary with about 450000 entries and several search options
Linguee: This online dictionary is available on the web and as a downloadable app for your smartphone! You can search a word and Linguee will provide the translation, sample sentences in both English and its translation in German, the grammar (part of speech, gender, etc), and frequency of use along with alternative words and phrases associated with the word.

News:

BBC: Languages, German: Introductory German lessons, video tutorials, German phrase guide for both slang and holiday phrases. Links to a variety of German news, TV, and radio sources, some with videos and subtitles.
Deutsche Welle: News and analysis of the top international and European topics Current affairs and background information on politics, business, science, culture, globalization…
Networking European Citizenship Education | bpb: Handouts, videos, news.
Frankfurter Allgemeine: This website is available as a mobile app and offers the current happenings in the Nord-Rhein Westphalia region and across Germany. The articles are categorized under Politics, Finance, Sport, Society, Fashion, Travel and many more! The articles are completely in German and premium membership permits full access to certain special edition articles.
Tagesschau: It provides news updates in the form of short videos. The videos include narrations by the tagesschau filming crew with short captions in German throughout the video. These videos also include first-person accounts/reports of the situation at hand.

Test/Quiz Yourself:

about.com's German Games and Quizzes: A great compilation of online quizzes on a wide range of topics ranging from grammar and listening to culture and current events.
Games for Language: Quick German Games: Simple, repetitive games for practicing everyday vocabulary and simple structures. You'll either find these annoying, or you'll like the quick review/lessons they provide. If you like the format, follow the instructions to register for a full course for free.
Goethe Institut: Testen Sie Ihr Deutsch: Challenging 30-item quiz. A score of 20/30 would already be very good!
Grammatikspiele: Here you can find a selection of grammar practice games. Most require both some grammar knowledge for deciding where you want to go, and some simple video game skills in terms of maneuvering the bug or the car or whatever you're controlling in order to actually get there (e.g. Käfer Karl needs to get to the correct answer through a moving "minefield" of killer spiders). Each game is preceded by a German summary of the grammar being practiced, and a German explanation of how the game works, and is labeled according to the level for which it is intended (A2, B1, B2) Via the navigation bar at the top, you can also find links to additional grammar tests, exercises, explanations, and resources.