[[Open Data Kit: includes built in publish data function to send completed data to an online database and from there, link in with Google's Fusion Tables and Earth.
Fulcrum
iMapInvasives: all-taxa invasive species mapping tool; workes via phone's web browser
CyberTracker
WildObs
iBats
Environmental Data
SoilWeb: portable version of online interface to USDA-NRCS digital soil survey
LightTracker: Twilight, Sunrise, Sunset and solar noon information for any date, moon phases and rise for any date
RiverFlows and WaterTracker: view data from USGS and NOAA gauge sites to get real-time river-level information.
NY Flora Association Blog: A list of field guides for iPhone/iPad has been put together by the NY Flora Association and can be found here. It includes guides to everything from plants to mushrooms.
Mapping, GIS, & GPS
GPS Essentials
iGIS
MotionX GPS
ArcGIS
Google maps/Google Earth
gvSIG mini
GPS Status
Nokia Maps: independent of a data signal (maps preload) and provides voice navigation, tilt and night views, 3D cities, and numerous gps-enhanced services as well as syncing with their full program on a PC
EveryTrail: record trip route, add photos and videos, share route, and download to google earth
PhenoMap: map plantphenology; upload images to a Flickr group.
WolfGIS
GISRoam
QGIS for Android (Uunder development)
Field Work Utilities
Random Numbers
Smart Measure: rangefinder; measure the distance to and height of an object
Theodolite: overlays real time information about position, altitude, bearing, range, and inclination on the live camera image
EMD Periodic Table of Elements
TASA Geotimescale: timeline of eons
Molecules: 3d models of molecules and enzymes
Citizen Science
Project Budburst: national field campaign designed to engage the public in the collection of data on timing of leafing, flowering, and fruiting of plants
What’s Invasive!: submit geotagged photos and observations of invasive species
IveGot1: Identify and report Invasive Species in Florida
Nature's Notebook Android App: from USA-NPN's. Record observations on hundreds of species of plants and animals, as well as add new locations and species to your list in the field.
iMapInvasives:online tool for invasive species reporting and data management.
the USDA National Agricultural Library has a webpage with smartphone applications for invasive species monitoring and identification: link
Teaching Tools
Skeptical Science
GeographCA
R Instructor: an interactive and multimedia tool designed to facilitate the learning process of R.