Trying to find out where a web part is from

A user wants us to implement a Web Part called Script Editor under the "Media and COntent" section, but I am not sure what this webpart is or where it came from. Is this OOTB SharePoint feature?

Another one I am looking for is under "Forms" and called "HTML Form Web Part"; any ideas if this is also OOTB or a 3rd party?

Thanks in advance for any input and\or answers.