I insure my Tiny House with Foremost. The process was straightforward and easy. I contacted them directly to get a quote versus going through a broker/agent. Normally a broker/agent can write for several companies, but I found the rates through Foremost to be lower than a broker/agent. Foremost is part of farmers which is obviously a big player in insurance. To get insured through Foremost, the house must be certified to meet or exceed RVIA standards.
Lending for Tiny House enthusiasts is limited. Specially if you are building it yourself. Not many banks are open to financing a tiny house which is why I was impressed when LightStream created a dedicated page to inform about financing for tiny houses. I have recommended this company to others with good feedback.
LATCH is a support community for tiny house enthusiasts in Los Angeles. If you are in Los Angeles and want to learn how to build a tiny house, LATCH is a great support network. I'm personally involved in helping LATCH grow and it's where I spend my time advocating the tiny house movement.
Alexis and Christian along with the Morrisons have been around a long time promoting the tiny house movement. They run this site offering a variety of plans for tiny houses. Getting architectual plans is an important step in the build of your tiny house. This is a good site to evaluate different designs and evaluate the one that is right for you.
Tiny Home Builders
Dan offers a great amount of education in tiny houses. The site itself is a great resource on learning how to build a tiny house.
Sweet Home 3D
Sweet Home 3D is a free interior design application that helps you draw the design of your house. This is the software I used to create the layout of my tiny house. It's pretty easy to learn to use and way cheaper than hiring a designer.