Free open source survey software, it can be used on the LimeSurvey.org site, or you can install it on your own server if you have one.
The self-hosted version is completely free of charge, while the version hosted by LimeSurvey comes in free and paid versions.
WEBSITE (HOSTED & SELF-HOSTED) – LimeSurvey.org
Free open source form software, available to either self-host or host on Webform.com. The version hosted on Webform.com comes in free and paid versions.
WEBSITE (HOSTED) – Webform.com
WEBSITE (SELF-HOSTED) – Webform source code