Recommendation from Greeninfo Network's MapLines newsletter:
"Attention land trusts, weed mappers, trail maintainers and others - Are you ready for the Spring field work season? GreenInfo recommends using this customizable, free app for collecting data in the field - Fulcrum App, which offers a free single user plan for storing up to 100 mb of data."
According to their website, with Fulcrum, you build apps to your specifications, allowing you to control exactly what data is captured from the field and how. Maintain high standards of quality to minimize rework, QA/QC, and error correction by getting it done right the first time.