We've added some of the hardware that we are commonly finding ourselves using in our projects.

The Raspberry Pi is still has the highest power/dollar ratio of any single board computer you can buy today.
Arduino Compatible Atmega328p
We use LEDs for just about every project! We can't quite get enough of them.
4-32V to 1.25-30V Step-down Power Regulator
Temperature Sensor
Instantly make any home automation project more intelligent!
Water flow meters can be used to track how many liters/gallons are being used over a span of time.
Darlington Arrays are an incredibly cheap, safe and easy way to boost output from GPIO pins.
This 5 Volt DC Relay works well when used with a Raspberry Pi / Arduino with a Darlinton Array
12v water valves are the cheapest way to switch water off and on.
10 Watts 12 Volts Monocrystalline Solar Starter Kit
100 Watts 12 Volts Monocrystalline Solar Starter Kit
Batteries! Can never have enough
Small, light weight power source for wearables and other portable projects.