Using the TRESTIMA mobile application and TRESTIMA web-service you can measure forest effectively and accurately just by taking photos using your Android phone.
You can create free credentials for TRESTIMA from www.forestmeter.com (Finnish users www.metsanmyynti.fi).
If you just want to browse the app and see how it looks you can login with 'test', 'test' credentials - these credentials won't save any information and will not provide any measurements results.
More information from www.forestmeter.com and www.trestima.com.