I wrote these mainly for my own use, but took the time to productize them, so charge for them. That said, I like them being used and doing good, so if their price is a barrier, here is an opportunity to try them for free…
Timestamped Field Notes:
I use this myself for Raptor Monitoring taking timestamped notes when trying to keep binoculars on Peregrine Falcons, Prairie Falcons and Golden Eagles. Some use ethograms with primates, spiders, and more. It has been used for observation notes for everything from humans to whales and many more. Some use it for taking health log notes. The application is iOS only, but it is free for the month:
https://www.neukadye.com/mobile-applications/timestamped-field-notes/
Since this application is iOS only, I made Notes Collector free for the week on Android:
https://www.neukadye.com/mobile-applications/notes-collector/
Field Triangulate:
I wrote this for wildland firefighting (locating smoke columns in the mountains) but a number of wildlife biologists use it for radio telemetry triangulations. Take two points plus compass bearings to a destination point and it calculates the latitude/longitude estimate for that point: iOS and Android, and free on IOS for the month, on Android for the next week:
https://www.neukadye.com/mobile-applications/field-triangulate/
Neukadye 