Omni Calculator - Helping you make rational decisions, one calculation at a time.
Startup Stash - A curated directory of 400 resources & tools for startups
Numbr - An elegant calculator for the web
StartupResources.io - Tightly curated lists of the best startup tools
Soulver - Soulver is a software application that functions as a calculator that allows you type a continuous stream of information rather than having to input data into multiple cells.
Founded X Startup Stats - Find the best country to build your startup in