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Asking questions is important:

• for language learners, who would like to ask something or for something in a lesson or as a tourist abroad. They also want to know what to expect in a situation.
• for students, who are preparing for a language exam and would like to prepare for the examiner's questions with creative answers. Or just don't want to be surprised.
• for teachers, when they are preparing interesting lessons for their students and help them practice fluency and accuracy.

So I have collected some professional sites where you can find free materials for your preparation. I am also sharing some details with you so you can find out which suits you the best.

http://iteslj.org/questions/ - many topics with lots of questions.
:( Some of the questions are repeated.
:) You can find questions for all levels from beginners to advanced students. The topics cover a wide range of details; eg. you can find Sports and also Baseball, Basketball.

http://www.eslconversationquestions.com/english-conversation-questions/topics/ - currently 104 topics, so you can be sure to find the one you need.
:( No more than 15-20 questions within each topic.
:) The questions are really interesting and thought-provoking. Some of them are quite fun to be answered.
EXTRA feature: http://www.eslconversationquestions.com/english-conversation-questions/grammar/ lists grammar topics under which you find questions that help you practice for accuracy.
Levels: intermediate and above.

http://www.esldiscussions.com/ - very many themes from A-Z, including Antarctica, Hangovers and Zombies. Each of them offers 20 questions for pairwork discussion.
:( Some questions are suitable for lower levels but they are difficult to collect from the lists.
:) Questions are downloadable in doc or pdf format.
Levels: mostly for pre-intermediate and above.

http://teflpedia.com/Category:Conversation_questions - 163 themes from Abortion to Your country.
:) Quite convenient to use if you are familiar with Wikipedia. The themes are divided into subtopics to give you more ideas and questions.
Levels: pre-intermediate and above.

http://www.proofreadingservices.com/blogs/esl/14711713-24-excellent-esl-conversation-questions-for-adults - 24 questions altogether.
:( No topics.
:) Perfect to be used in daily life. This site is not only for those who are preparing for a language exam! Some questions really make a conversation lively.
Levels: intermediate and above.

http://tigertesl.blogspot.co.at/2008/06/converstation-topics-and-questions-for.html - 15 topics altogether.
:) You might think that this is not enough. However, each of the themes is divided into further subtopics and include lots of questions. Besides, the topics themselves are up-to-date.
Levels: intermediate and above.

http://bogglesworldesl.com/question_prompts.htm - 12 themes.
:) Each link will open a doc for you. This inlcudes not only questions but also a worksheet to help you study topic-related vocabulary.
With some tailoring, this site is suitable for all levels.

http://printdiscuss.com/category/esl-conversation-questions - 5 topics with 20 questions in each.
:( Although a vocabulary list is also available for all of them, this does not include too many words.
Suitable for all levels, best for beginners to pre-intermediate.

http://simpleesl.com/english-conversation-questions/
- 16 role plays. Now you will know what questions you can expect in everyday situations.
:) Perfect for those who are preparing to travel abroad as a tourist or to pass an elementary or intermediate level language exam.

- The same site offers 79 conversation question topics for all levels. Some of these are perfect examples of question formation (eg. Questions using 'who'). The lists are downloadable.