Formstack is probably the most powerful and advanced web form builder currently available on the market. Most Formstack reviews are positive. Formstack pricing, however, isn't very inviting - the cheapest plan starts at $39/mo and goes up to $249/mo. Even in the top plan the number of users who have access to account is limited (25 users for Formstack Platinum). If you are looking for a free Formstack alternative and don't need all the bells and whistles, you should consider a new free Bitrix24 web form builder. Bitrix24 has the following advantages - free unlimited entries, unlimited fields and up to 12 users who can work with your form data even in the free plan. Forms are fully customizable, including CSS, so you can create any form type - contact, online orders, feedback, resume submission, quote request, etc. Field rules (conditional logic) and post submit actions are available for free as well. You don't need to know HTML, PHP or JavaScript, embed code that can be inserted to Wordpress, Drupal, Joomla or any other CMS is generated for you. You don't even need to have a website - Bitrix24 will host forms for you for free as well.
* Please note that the information may have changed since the publication. For current prices and features please visit Bitrix24 pricing page.