Apps for all platforms with any license





Web / Online

Show 21 less popular platforms
  • Stack Overflow

    Stack Overflow, part of Stack Exchange , is a free, community-driven, reputation-based Q & A site for computer programmers.


    Stack Overflow icon

    Free Web Android iPhone

  • Reddit

    Reddit is a social news site allowing users to submit articles, vote on them, and engage in discussions. Like other social news websites, Reddit is divided into categories.


    Reddit icon

    Freemium Web Android iPhone Android Tablet iPad

  • Stack Exchange

    Stack Exchange is a fast-growing network of 84 [and counting] question and answer sites on diverse topics from software programming to cooking to photography and gaming.


    Stack Exchange icon

    Free Web Android iPhone Android Tablet iPad

  • Quora is a question/answer service allowing users to pose questions that other users can answer, each question and answer can have comments, each users can write one individual answer and there can be a summary answer.


    Quora icon

    Free Web Android iPhone

  • Slant

    Slant is a collaboratively edited resource that helps you quickly make decisions. Instead of having to read multiple blog posts or dig through comment threads you can read summarized perspectives on topics with no definitive answer.


    Slant icon

    Free Web

  • Akinator

    Akinator the Genius can read your mind and tell you who you're thinking of by answering a few questions.


    Akinator icon

    Freemium Web Android iPhone Blackberry Windows Phone iPad Amazon Echo (Alexa Voice Service)

  • Slido

    Slido is an award-winning audience interaction platform for meetings and events. It allows meeting and event organisers to crowdsource top audience questions, engage participants with live polls and capture valuable event data.


    Slido icon

    Freemium $ $ $ Web Android iPhone

  • Super User

    Super User, part of Stack Exchange , is a Q&A site for computer enthusiasts that's free.


    Super User icon

    Free Web

  • Niftio

    Niftio is a new presentation platform that aims to help any presenter master the art of presentations from the moment he creates the slides to the moment he gets off the stage.


    Niftio icon

    Free Web

    • Discontinued This software is no longer maintained.
  • Question2Answer

    A Q&A site helps an online community to share knowledge. No matter what your area of interest, people with questions can get super answers fast. Question2Answer is a popular Q&A solution.


    Question2Answer icon

    Free Open Source Mac Windows Linux Web MySQL Community Edition Self-Hosted PHP

  • Server Fault

    Server Fault is a Q&A site for system administrators and IT professionals that's free.


    Server Fault icon

    Free Web

  • Apps and Oranges

    Apps & Oranges helps people find and recommend the best apps for getting stuff done. It's social Q&A: Question & Apps.


    Apps and Oranges icon

    Free Web

    • Discontinued No longer updated. Last actions date back to 2012 and new apps cannot be added due to unresolved issues. In 2013 Brian Morykon, Co-founder and Designer of the site, talked about a new version of Apps & Oranges more focused on web apps:
  • Wooclap

    A simple solution to interact with your audience during a live conference, a corporate meeting or inside a classroom.


    Wooclap icon

    Freemium Mac Windows Web Windows Mobile iPhone iPad

  • Pubble

    Pubble is the world's best Q&A platform. We make it simple and easy to add a great Q&A platform to any blog, website or Facebook page.


    Pubble icon

    Commercial Web

  • Askme

    Startups get your queries answered by the World's Top Investors and Entrepreneurs. Startups + Investors +Entrepreneurs Connect.


    Askme icon

    Free Web

  • Yahoo! Answers

    Yahoo! Answers is a way to find and share information. You can ask questions on any topic, get answers from real people, and share your insights and experience.


    Yahoo! Answers icon

    Free Web

  • Aardvark

    Ask questions, get *live* answers from your network! Aardvark finds the perfect person to answer any question in real-time.


    Aardvark icon

    Free Web

    • Discontinued In February 2010 Aardvark was acquired by Google. It was discontinued in September 2011.

    An obvious clone of ( ), offers creating a profile URL that can be addressed by others users with questions.


    Free Web Android iPhone

  • OSQA

    OSQA is the free, open source Q&A system you've been waiting for. Your OSQA site is more than just an FAQ page, it is a full-featured Q&A community.


    OSQA icon

    Free Open Source Web Self-Hosted Python Django

  • AskBot

    Askbot is a Q&A system, like StackOverflow, Yahoo Answers and some others. Askbot is based on code of CNPROG, originally created by Mike Chen and Sailing Cai and some code written for OSQA.


    AskBot icon

    Freemium Web Self-Hosted Python Django

  • iBoske

    Life is full of decisions, have the answers at your hand. Join the #1 decision making and question solver expert community. iBoske allows anyone to easily create decision trees. It can be used as a troubleshooting tool.


    iBoske icon

    Free Web


    Curious cat is a small social networking tool that allows you to connect with your followers by providing them with the appropiate tools to communicate with you.


    Free Web

  •, formerly Formspring, is a webspace for conversations - where you can meet interesting people, express yourself about anything and expand your life. With over 30 million members, Spring.


    Free Web Android iPhone

    • Discontinued has joined forces with
  • CodeProject

    CodeProject is a community of Software development and Design developers joined together with certain common goals: to learn, to teach and to have fun programming.


    CodeProject icon

    Free Web

  • Pigeonhole Live

    Audience engagement tool for crowdsourced Q&As, polls, and surveys. Built for mobile, works on all web-based interfaces. Perfect for enterprises and companies as a backchannel for their town halls, all-hands meetings and conferences.


    Pigeonhole Live icon

    Freemium Web Android iPhone iPad Blackberry 10