I have recently uploaded an India GST Android App which is now available in Google Play Store and is under Open Testing - I invite you to try it out the links are as follows:
 
You can join using Google Play on Android
https://play.google.com/store/apps/details?id=com.netpointapps.iginvoiceandstatus
 
You can also join on the web
https://play.google.com/apps/testing/com.netpointapps.iginvoiceandstatus
 
You may give  me your feedback at -  netpointkolkata @ gmail.com
 
Thanks
Pavan