Publishizer - Launch a preorders campaign for your book
Founder Society - An invitation-only organization of entrepreneurs
Noteflight - Noteflight is an amazing online notation editor.
Single Founder Handbook - A step-by-step guide for bootstrapped software entrepreneurs
Fulfil.IO - Cross Channel (offline, online, social & mobile)ERP for retailers.
Zero to Sold - How to start, run, and sell a bootstrapped business