The best apps for expats in Nepal

You are right to bring up this question of Apps. In the travel business, for example, in the old days visitors who came to Nepal would come here with hardcover guidebooks like Lonely Planet. Nowadays apps are a growing market and replacing the guidebook. These days developers are turning out travel apps by the dozen and while I am no authority on the subject, those interested in that same field of travel might check out one app called Wolfmatrix. I hear it offers travel advice for those considering trekking to Everest, Annapurna Base Camp and Poonhill. There must be others too.
In another area, internet connectivity being so poor in Nepal, I think there'd be good interest in communications apps, companies with services like those offered by Viber, which in the US is a household name as a result of its association with Western Union. From there, I think I am right in saying that subscribers can even send money to 65 cities around the world. I hear Viber is potentially interested to work in Nepal but they don't have an office here. And if they have opened here, it is because in Nepal most users do not use international credit cards, which means they do not have access to Viber's premium services. Besides, here in Nepal, foreign exchange controls and the non convertibility are real obstacles to international anything, so here it's a totally different ball game for everyone really, and that includes "would be" expats that you are citing.