Automotive
- 0-60 Calculator – Calculate a rough estimate of your 0-60 time using curb weight and flywheel horsepower
- Car-Part.com – Online searching of most junkyards in US
- JavaScript Tire Size Calculator – Calculator to show you the difference from one tire size to another
- Engine RPM Calculator – Planning on re-gearing? Check out this calculator to find out where your rpms will be
- Car vs Bike MPG calculator – Calculate how much you will save driving your bike instead of your car
- Barry’s Tire Tech – Tire load tables and graphs, figure out how much psi you need to carry your load.
- Trailer Tire Sizing – etrailer.com’s chart for trailer tire sizes
- Exhaust Size Calculator – Exhaust size calculator based on bhp
Electronics and Music Gear
- DIY Stomp Boxes – Forum based site with many users, all devoted to building stomp boxes
- SSGuitar.com – A forum dedicated to building, repairing, and modifying solid state guitar amplifiers!
- General Guitar Gadgets – Lots of schematics for guitar-centric projects
- Runoff Groove – Free schematics for guitar effects pedals and battery powered amps
- Smallbear Electric – Online store with effects pedal parts and more
- Tonepad.com – DIY music project resource
- American Wire Gauge table with load limits – Need to know how many amps can pass through your wire? Here you go.
- Analog Alchemy – Electronics projects by Joe Davidson
- Automotive Audio Calculators – Calculators for resistance, box volume, tube length and more
- StewMac.com – Online store that has all kinds of guitar parts and electronics
- Peak SPL Calculator – Online calculator, put in your speaker and amp specs and find out how loud you really are!
- Guitar String Calculator – Basic but very useful guitar string tension, size, etc calculator
Energy
- BTU Calculator – Calculate heating and cooling losses for your home
- Earth911.com – Green ideas
- Maine Solar House – House in Maine entirely powered on solar: passive and active, water and pv
- Hearth.com – Forum about wood stoves and hearths
- Sweep’s Library – Firewood BTU Comparison Charts – Chart listing btus and lbs/cord for many types of firewood
- Log Weight Calculator – Great little calculator for calculating the rough weight of fresh cut timber
- Home Heat Loss Calculator – Excellent online calculator for figuring out your btu losses in your home
Mechanics
- ArboristSite.com – Arborist-centric forum, although the chainsaw crowd is the most active
- Hazen-Williams Equation – Friction head loss calculator for pipes
- Sheldon Brown’s Bicycle Gear Calculator – It’s exactly what it sounds like
- Sheldon Brown’s Chain Maintenance – Excellent tutorial showing how to care for bicycle chains
- Chain Saw Collectors Corner – Chainsaws specs from Aircraft Specialties to Zundapp Werke and all those in between
- Hydraulic Cylinder Calculator – Calculator to figure out your maximum force given a certain size piston and pressure
- Aquarium System Volume Calculator – Calculate your aquarium (or other container) size in gallons
- Motorcycle Tire Size Conversion – Chart comparing old and new motorcycle tire sizes
- Making Drag Pipes Work – Dyno-tested motorcycle drag pipe modifications to actually make power, not just noise
- Motorcycle Dyno Charts – Motorcycle dyno charts for many modern makes
- ATV Tire and Wheel Size Application Chart – Chart of many ATV tire/wheel combos
- The Sagulator – Shelf Sag Calculator
- Pyramyd Air FPE Calculator – Calculate the FPE of any projectile given the speed in FPS and weight in grains
Technology
- EveryMac.com – Excellent resource to find out specifications on new and old Apple hardware
- Hex Color Code Generator – Generate custom hex based colors with an intuitive graphical interface
- MLCalc – Excellent loan calculator with interactive graphics
- Codecademy.com – Free online programming “courses”.
- BrowserShots.org – Check how a site looks in almost any environment
Tractors
- Johnny Popper Forums – Forums about Dubique built two cylinder John Deere Tractors
- The John Deere Model 40 and Other Dubuque Built Tractors of the Fifties – Self explanatory eh?
- Meyer John Deere Tractors – Stats and pictures of old John Deere Tractors
- TractorPart.com – Restoration supplies for John Deere 2 Cylinder tractors and more
- JD40.com – Info about the John Deere model 40 as well as tractor projects like a DIY backhoe
- TractorData.com – Information on all makes and models of tractors
- Antique John Deere Tractors – John Deere tractors and implements of old
- Genesee Products – Electronic ignition conversions for old tractors, even 6volt!
