KoBoToolbox is a suite of tools for field data collection for use in challenging environments. The software is free and open source and works both on and offline. Most of our users are people working in humanitarian crises, as well as aid professionals and researchers working in developing countries. KoBoToolbox is a great way to begin collecting data and has a very easy user interface. KoBo Toolbox is based on the open-data kit interface, and all forms can are in the standard XLSForm format.
KoboToolBox and XLSForms
KoBoToolbox builds its forms using a widely shared standard called XLSForm. XLSForm makes it possible to create very complex electronic forms in Excel. All forms created with KoBoToolbox can be imported from or exported to XLSForm files. This means they are fully compatible with other related tools such as ODK.