As well as the apps I've previously written (described below) I've more recently modified the source of Linphone to allow it to autoprovision onto an Asterisk PBX using only the phone's unique IMEI number and to allow out of the box SIP URI dialling.
I've trialed this 2-4 devices geographically spread. I was approached by a company in Japan based on this work, but unfortunately lanuage barrier and financial consideration meant this was dead end.
Since getting my G1 in 2008 I have developed a number of apps:-
I've also made some modifications to an existing calendar app so that it can sync with Funambol's server using the SYNCML protocol.
Having changed to OwnCloud and iCal I've moved to aCal which has sync and multiple calendar capabilities built in.
Work as an Employee, Consultant, Contractor / Self Employed or via Limited Company