Bootstrap Zero - Open-source, free Bootstrap templates collection.
Indie Hackers - Connect with fellow entrepreneurs, developers, and bootstrappers who are sharing the strategies and revenue numbers behind their companies.
Bootstrap Magic - Create your Bootstrap 4.0 themes easily with magic
PipeCandy Insights Platform - 50+ business insights about eCommerce companies that matter!
Cruip - Landing page templates for startups
Makerbase - Like a user-editable IMDB for product makers