The Kitchen Sink of Spanish Exercises and Tests/Quizzes:
This site has a little bit of everything to offer and you can find tests and quizzes on many different topics.
This link is a great reference if you need to check the conjugation of a verb. The list of verbs is quite comprehensive and if you can't find the verb you're looking for, see if you can find a similar one or one with a similar root.
A useful dictionary for Spanish. It also has French and Catalán (Barcelona region).
Spanish Listening Practice
This site from the University of Texas, Austin is great for practicing listening comprehension. There are different levels from beginning to advanced and there are videos as well.
Spanish Grammar Exercises
A great site for practicing language and connecting it to music. Some fun videos and activities too!
AP Directed Response Questions
A great site for AP students who want to practice the 5-question directed response portion of the AP exam.
Practice for the New AP exam
Here is another great link to a variety of exercises and even more useful links. Some of this sites exercises are geared to helping with the new AP exam format.
Extensive Spanish culture and language
An amazing website for learning everything there is to know about Spain. There is also an excellent section called "Aula de lengua" for Spanish language lessons (check out "Pasatiempos de Rayuela").
Here is a very diverse website to find articles that will fit every interest. Take some time to check it out.
Great Spanish Music Lyrics and Music
This is a great site if you want to find the lyrics to a song in Spanish or if you want the chords/music to a song in Spanish.
Great Spanish Music online
Do you want to listen to Spanish music while you're working online? This site has a great variety to suit your tastes.
Idiomatic expressions in Spanish
Want to add some more "modismos" to your vocabulary? This site gives you random ones to learn at the click of your mouse.
Podcasts about Spain
Listen to real audio conversations in Spanish. Marina, a native Spaniard, and Ben, her British boyfriend, talk about life in Madrid.
Spanish language skill builder
This site has some good (free) exercises to practice Spanish and some more that you can pay for and assess yourself.
Spanish practice and Crossword puzzles
A great site to practice your Spanish from basic to advanced. You can also improve your vocab by trying one of the crossword puzzles.
Subjunctive in Adverbial Clause (siempre vs a veces)
Here is a good, detailed explanation of the use of the subjunctive with adverbial clauses. There are exercises at the link at the bottom of the lesson.
Learning Spanish for Travel Links from IMT
Spanish Language Training
This site has interactive Spanish grammar exercises, grammar help, vocabulary exercises, etc.