We have a custom app on salesforce.com. We would like to make a mobile app for this.
This could use salesforce sdk.
The app is around scheduling and giving access to mobile workforce to:
1. Sites they need to visit on a specific day
2. Checkin on the site when they are in the site.
3. Update job as completed when its done.
All the services for use cases already developed. Therefore you only need to worry about giving a cool friendly ui.