You’re in lubest of the internetck! You’ve just found a directory of links leading to the best hand-picked FREE engineering tools on the internet! This list is regularly updated with new sites being added to the bottom of each category, so bookmark this page for future reference.

EngineerDog loves sniffing out the most useful links on the internet , so let me know what your favorite sites are!

 **Last Updated: January 2018, Additions, cleanup, & removal of dead links.

# Description Link
1 Tube Bending Calculator: Tells you how to measure structural tubing for bending.
2 Cut List Calculator: Tells you the most efficient method of cutting bar stock to minimize waste.
3 Tolerances and Fits Calculator: Tells you how to size shafts and holes to achieve the desired fit.
4 Concise Welding Symbols chart  &
5 Machining Feed & Speed Calculator
6 Alternative Machining Feed & Speed Calculator
7 Easily design layouts for laser cut boxes
1 Testing Specifications: ASTM (Use google translate)
2 Testing Specifications: ANSI, Mil, SAE Specs and more
3 Info summary on any company:  # employees, revenue, age, etc.
4 Website SEO report (1 free review/week!)
5 Website stats and valuation
6 Website Domain Authority Checker
7 Temporary Email Address  (alternative method)
8 Comparison shop for optimum shipping rates
9 Share your screen with anyone over the web. 
10 Send a fax without a fax machine
11 Send a fax without a fax machine
12 Official Free Browser Based Version of Microsoft Office
13 Edit pdfs for free online
14 Huge database of free custom fonts online
15 Send anonymous emails (Hello Boss…)
16 Mail your enemy a piece of shit in a box (Yes, this is how I do business)
17 Mail your enemy an envelope full of glitter (OMG yes)
18 Anon wake up phonecall for yourself (or that enemy)
19 Pdf to DXF converter (20 free uses)
20 HashTag Selection Optimizer (use in table mode)
21 Make your own graphpaper
22 Printable Planner Organizer System 
23 Remove backgrounds from photos
24 Buy & Print USPS Shipping Label free from home (Paypal)
1 Best Online Fastener Sizing Chart
2 Shoulder bolt dimensions and strength
3 Online tap drill chart- Tells you what size to predrill tapped holes
4 Table of NPT Thread Sizes
5 Printable fastener sizing layover charts
6 All Drill sizes conversion chart
1 Sheet metal thickness gage chart
2 Custom Spring Calculators-Design the exact spring you need
3 Material properties For everything
1 McMaster Carr: wide array of 3d models, go-to for hardware
2 GrabCAD: Huge database of user submitted models
3 3DContentCentral:  Database of user submitted models
4 Misumi: 3d models of small mechanical parts
5 3d models of gears
6 Google Sketchup Model Database
1 Diagram editor: Great for drawing flow charts
2 Octave: an opensource alternative to Matlab
3 Draw the floorplan of your house, arrange furniture, see results in 3D.
4 Electronic Wiring / Analog Circuit CAD
5 Top Rated Free Anti-Virus Software: Avast
6 Finds accidentally deleted files.
7 Circuit simulator
8 2D Drafting CAD similar to autocad
9 ‘Ccleaner’ computer cleaner and speed booster software
10 PCB Design software
11 Free Parametric 3D modeling software (good for programmers)
12 Free Ladder Logic Software (the actual PLC is only $70)
13 Desktop Unit conversion  tool
14 Fritzing for documenting arduino & other circuit schematics
15 Free online image vectorizer: convert JPEG/PNG to DXF/SVG
16 Free online image vectorizer: convert PNG to SVG
17 Gear Design Tool (Some is free but has paid component too)
18 Convert SVG to STL: (Thickness ~5mm)
19 Free source code editor, useful for programming
20 OpenSource Ver of Windows Snipping Tool. (Works on Windows 7 too)
1 Free online 3D model file converter: stl to obj to ply
2 STL File Viewer that lets you make measurements
3 STL FILE Editor: Meshmixer
4 STL File 3d model Voronoi effect editor: voronator
5 Slic3r 3D printing slicing software
6 Repetier Host, 3D printing Gcode Generator & Printer UI
7 Lathe-R-Beam Spins 2d Drawing around axis & creates STL File
8 Cura: Combined slicing, g-code generating, & UI for 3d printers
9 OctoPrint-Remotely monitor your 3D printer
10 Super Simple parametric gear model STL generator
11 Onshape 3d modelling program
12 TinkerCAD 3D modelling program
13 OPENSCAD Parametric 3D modelling Program
14 Fusion 360 3D Modelling
15 2.5D control software: CNC Router/laser/ plotter G-code generator & UI
16 Deltabot 3D Printer position calculator
17 Laser Web- Free software toolchain for laser cutters & engravers
18 Open Source Vector Graphics Editor (like Adobe Illustrator)
19 How to get STL Thumbnail View using Windows Explorer
1 Find a local DIY 3D printing service
2 Find a local DIY CNC, CAD, or 3D printing service
3 Find a local DIY CNC, CAD, 3D printer, Laser fabrication service
4 Online waterjet cutting (Instant free quotes)
5 Online laser cutting, 3D printing, & metal machining service.
6 Buy bulk Chinese products cheap and resell for profit
7 Buy bulk Chinese products cheap and resell for profit
8 Timing Belt Center Distance Calculator
1 Learn any language free
2 Shorten Long Urls
3 Online Stopwatch
4 Online super calculator (does algebra too)
5 Online Interpolation Calculator
6 Find websites similar to ones you know you like
7 Find books/music/movies similar to ones you know you like
8 Google Keep: Free synced notes between computer & phone
9 Google Drive: 15Gb Free online data storage
10 Find the original URL that’s hiding behind a short URL.
11 Website Name Availability Checker (Finds similar options for you)
12 507 Mechanical Movements: See various linkages in motion
13 Can You run it, automatic system requirements checker for games.
14 Free OpenSource Password Keeper
15 Convert Photo Image to look like a cartoon/drawing
16 Internet ruler: Use your computer screen as a ruler.
17 Turn any image into a cartoon
18 Make your computer screen dimmer if its still too bright
1 Simple/Effective Investing Savings Browser Calculator (Dave Ramsey)
2 Simple/Effective Home Buy vs Rent Browser Calculator (NYT)
3 Free Credit Scoring that doesn’t affect your score to check.
***Online Materials Suppliers***
1 Cheap Supplier of various metal raw material
2 Cheap Supplier of various metal raw material
***Engineering/Maker Newsletters***
1 Engineering, design, and business. Interesting & insightful blog articles.
2 Instructables newsletter, how to guides & project ideas
3 Hackster.I.O, hacked hardware projects & ideas.
4 Make Magazine standard newsletter
5 Maker Pro Newsletter, my favorite one
6 Bolt newsletter


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