About ODK XLSForm
XLSForm is a form standard created to help simplify the authoring of forms in Excel. XLSForms are simple to get started with but allow for the authoring of complex forms. Forms designed with Excel can be converted to XForms that can be used with ODK tools.
To design your form, refer to the XLSForm form design documentation. Once the form has been designed, use XLSForm Online, XLSForm Offline, or if you are comfortable on the command line, pyxform.
Your anti-virus may report that XLSForm Offline has a virus. This is a false positive that is triggered because virus writers sometimes use the same components we use. You can confirm the safety of XLSForm Offline by using the free and unbiased VirusTotal. You may also use XLSForm Online as an alternative.
On macOS 10.7 or later, you may get a dialog on startup warning you that the XLSForm Offline is from an unidentified developer. Control-click or right click the icon of the app to bypass this dialog. See About Gatekeeper for more.