The download button opens the iTunes App Store, where you
may continue the download process. You must have iTunes installed with an
active iTunes account in order to download and install the software. This
download may not be available in some countries.
From Zorayr Khalapyan:
ohmage MWF is an open-source participatory sensing technology application. It provides mobile-based data capture through inquiry-based surveys and temporally triggered reminders. All captured data are automatically timestamped, geocoded and uploaded to a centralized ohmage server for analysis and visualization. ohmage MWF is fully functional without network connectivity and can run on multiple mobile phone platforms.