Hyderabad-based ?Bulbul Apps?, an early childhood learning app developer for pre-schoolers has raised Rs 3.5 crore ($500K) in a fresh round of funding from Xseed Partners, Operator VC, Anblicks and Infolob. Bulbul Apps builds innovative, multimedia, interactive apps for tablets, smartphones, and other touchscreen devices for pre-school students. Bulbul Apps will use proceeds from the round of investment to build its B2B2C market, which it says is showing tremendous promise with an aim to serve a growing number of paid parents, subscribers.