RetailMenot - The RetailMeNot mobile app allows you to find deals on the go for both online shopping and in store shopping.
Overleaf - The online platform for scientific writing. Overleaf is free: start writing now with one click. No sign-up required. Great on your iPad.
Slickdeals.net - Slickdeals: The Best Deals, Coupons & Discounts on everything
TeXworks - The TeXworks project is an effort to build a simple TeX front-end program (working environment)...
Honey - Honey is a browser extension that automatically finds and applies coupon codes at checkout with a single click.
Texmaker - Texmaker, free cross-platform latex editor