Sparrow Technology has successfully developed apps for Android or Windows platform.
You can download from the following links:

1)      Diamond Weight Calculator App

Download Diamond Weight Calculator for your Android Device.

https://play.google.com/store/apps/details?id=com.abp.diamondweightcalc

2)      Diamond Weight Calculator App (For Windows)

Download Diamond Weight Calculator for your Windows Device.

http://www.windowsphone.com/en-us/store/app/diamond-weight-calculator/017874cd-f505-4bd1-9c0f-3e3a0028067e

3)      11^th Maths Semester 1

Download Quiz App for 11^th Maths Semester 1 for your Android Device.

https://play.google.com/store/apps/details?id=com.sparrow.gu11maths1

4)      12^th Maths Semester 1

Download Quiz App for 12^th Maths Semester 1 for your Android Device.

https://play.google.com/store/apps/details?id=com.sparrow.gu12maths1

5)      12^th Physics Semester 1

Download Quiz App for 12^th Physics Semester 1 for your Android Device.

https://play.google.com/store/apps/details?id=com.sparrow.gu12physics1

6)      Heart Beat Monitor App

Download Heart Beat Monitor appfor your Android Device.

https://play.google.com/store/apps/details?id=com.abp.observergerman

7)      Heart Beat Observer Pro App

Download Heart Beat Observer Pro app for your Android Device.

https://play.google.com/store/apps/details?id=com.abp.observerpro

8)      Heart Beat Rate Observer App

Download Heart Beat Rate Observer app for your Android Device.

https://play.google.com/store/apps/details?id=com.abp.observer

9)      General Knowledge Quiz App

Download India GK quiz app for your Android Device.

https://play.google.com/store/apps/details?id=com.pract.gkindia

10)   General Knowledge Quiz App (For Windows)

Download India GK quiz app for your Windows Device.

http://www.windowsphone.com/en-us/store/app/india-general-knowledge/8b175220-7ead-4514-aec5-b105ed1cdd55

11)   Heart Beat Rate Monitor (For Windows)

Download Heart Beat Rate Monitor for your Windows Device.

http://www.windowsphone.com/en-us/store/app/heart-beat-rate-monitor/42e636bc-32be-4a80-ad55-b2c4d6d3a0fe

1)      12^thChemistry Semester 1

Download 12^th Chemistry Semester 1 Quiz App for your Android Device.

https://play.google.com/store/apps/details?id=com.sparrow.gu12chemistry1

2)      11^th Chemistry Semester 1

Download 12^th Chemistry Semester 1 Quiz App for your Android Device.

https://play.google.com/store/apps/details?id=com.sparrow.gu11chemistry1

3)      11^th Biology semester 1

Download 11^th Biology Semester 1 Quiz App for your Android Device.

https://play.google.com/store/apps/details?id=com.sparrow.gu11biology1