Question: On which site which JotForm can be integrated  began as a paid service and added a freemium option in 2009?

Context paragraphs:
Mya (program): Mya was an intelligent personal assistant under development by Motorola.  Proposed features for the program included the ability to read emails and answer questions 24 hours a day.  Mya was intended to work with an internet service Motorola was developing called Myosphere, and was planned to be a paid service that would eventually be used by other mobile carriers.  A female computer-generated character was created to represent Mya in advertising.  While the quality of the character's animation was praised, it received criticism for being over sexualised.

TELCOMP: TELCOMP was a programming language developed at Bolt, Beranek and Newman (BBN) in about 1964 and in use until at least 1974.  BBN offered TELCOMP as a paid service, with first revenue in October 1965.  The service was sold to a company called On-Line Systems in 1972.  In the United Kingdom, TELCOMP was offered by Time Sharing, Ltd, a partnership between BBN and an entrepreneur named Richard Evans.

GEPIR: GEPIR is publicly available at no cost, but limits the number of requests per/day from an IP to 30.  GS1 offers a similar paid service, the GS1 Data Hub, which provides additional capabilities without the traffic limitations imposed by GEPIR.

UVa Online Judge: UVa Online Judge is an online automated judge for programming problems hosted by University of Valladolid.  Its problem archive has over 4300 problems and user registration is open to everyone.  There are currently over 100000 registered users.  A user may submit a solution in ANSI C (C89), C++ (C++98), Pascal, Java, C++11 or Python.  Originally it began without the last three options, but the Java option was added in 2001, the C++11 option was added in 2014, then the Python option was added in 2016

MailChimp: MailChimp is a marketing automation platform and an email marketing service and a trading name of its operator, Rocket Science Group, an American company founded in 2001.  MailChimp began as a paid service and added a freemium option in 2009.  Within a year its user base had grown from 85,000 to 450,000.  By June 2014, it was sending over 10 billion emails per month on behalf of its users.

Citysocializer: citysocializer (formally known as CitySocialising) is a subscription-based social networking website based in London and serving the United Kingdom as a paid service and the United States as a free service.  The website focuses on what it calls "Online2Offline", providing users a place to connect through common interests and events which lead to meeting new people offline.  The website has very few active users.

JotForm: JotForm is a San Francisco-based online form building company.  JotForm's software creates forms with a drag and drop creation tool and an option to encrypt user data.  As of 2015, JotForm had 2 million registered users and 7,000 form templates.  The forms can be integrated on external sites including MailChimp, PayPal, Stripe, and Salesforce.

Codecademy: Codecademy is an online freemium interactive platform that offers free coding classes in 12 different programming languages including Python, Java, PHP, JavaScript (jQuery, AngularJS, React.js), Ruby, SQL, and Sass, as well as markup languages HTML and CSS.  The site also offers a paid "pro" option that gives users access to a personalized learning plan, quizzes, realistic projects, and live help from advisors.

Ski lift: A ski lift is a mechanism for transporting skiers up a hill.  Ski lifts are typically a paid service at ski resorts.  The first ski lift was built in 1908 by German Robert Winterhalder in Schollach/Eisenbach, Hochschwarzwald.

Amara (subtitling): Amara, formally known as Universal Subtitles, is a web-based non-profit project created by the Participatory Culture Foundation that hosts and allows user-subtitled video to be accessed and created.  Users upload video through many major video hosting websites such as YouTube, Vimeo, and Ustream to subtitle.  It uses crowdsourcing techniques to subtitle video as well as having a paid service for professionally created subtitles.  Users of the project and service include Mozilla, PBS, Khan Academy, Netflix, Twitter, TED Talks, Coursera, Udacity, and Google.  Most companies listed have "teams" organized by Amara on the website that focus on translation and caption of videos.  Amara claims that it lowers the cost of captioning and translation by at least 95 percent because of their volunteer-based system.  Amara also provides an update blog.

Supporting paragraphs: JotForm MailChimp
Answer: MailChimp