Links:

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
***MACHINING & FABRICATION***
1 Tube Bending Calculator: Tells you how to measure structural tubing for bending.  http://www.benditonline.com/
2 Cut List Calculator: Tells you the most efficient method of cutting bar stock to minimize waste.  http://jonathan.overholt.org/projects/cutlist
3 Tolerances and Fits Calculator: Tells you how to size shafts and holes to achieve the desired fit.  http://www.amesweb.info/FitTolerance/FitToleranceImperial.aspx
4 Concise Welding Symbols chart http://www.jit-mfg.com/WeldSymbolsProof.pdf
5 Machining Feed & Speed Calculator http://www.daycounter.com/Calculators/GCode/Feed-Rate-Calculator.phtml
6 Alternative Machining Feed & Speed Calculator https://www.redlinetools.com/products/calculators
7 Easily design layouts for laser cut boxes http://boxmaker.connectionlab.org/
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***BUSINESS TOOLS***
1 Testing Specifications: ASTM (Use google translate) http://wenku.baidu.com/
2 Testing Specifications: ANSI, Mil, SAE Specs and more http://www.everyspec.com/
3 Info summary on any company:  # employees, revenue, age, etc.  http://www.manta.com/
4 Website SEO report (1 free review/week!) http://www.woorank.com/
5 Website stats and valuation  http://www.cutestat.com/
6 Website Domain Authority Checker http://checkpagerank.net/
7 Temporary Email Address  (alternative method) http://10minutemail.com/
8 Comparison shop for optimum shipping rates https://shipgooder.com
9 Share your screen with anyone over the web. https://www.join.me 
10 Send a fax without a fax machine http://faxzero.com/
11 Send a fax without a fax machine http://www.gotfreefax.com/
12 Official Free Browser Based Version of Microsoft Office https://office.live.com/start/default.aspx
13 Edit pdfs for free online http://www.pdfescape.com/
14 Huge database of free custom fonts online http://www.fontspace.com/
15 Send anonymous emails (Hello Boss…) https://www.guerrillamail.com/
16 Mail your enemy a piece of shit in a box (Yes, this is how I do business) http://www.shitexpress.com/
17 Mail your enemy an envelope full of glitter (OMG yes) https://shipyourenemiesglitter.com/
18 Anon wake up phonecall for yourself (or that enemy) https://wakerupper.com/
19 Pdf to DXF converter (20 free uses) http://www.aidecad.com/pdf-to-dxf-converter.html
20 HashTag Selection Optimizer (use in table mode) http://hashtagify.me/hashtag/3dprint
21 Make your own graphpaper http://incompetech.com/graphpaper/
22 Printable Planner Organizer System http://www.diyplanner.com/templates/official/classic 
23 Remove backgrounds from photos https://burner.bonanza.com/
24 Buy & Print USPS Shipping Label free from home (Paypal) https://www.paypal.com/us/cgi-bin/webscr?cmd=_ship-now
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***FASTENER CHARTS & REFERENCES***
1 Best Online Fastener Sizing Chart http://www.designrise.com/tools/fasteners/index.php
2 Shoulder bolt dimensions and strength http://www1.mscdirect.com/PDF/FASTENERS/SocketHeadShoulderScrews.pdf
3 Online tap drill chart- Tells you what size to predrill tapped holes https://littlemachineshop.com/reference/tapdrillsizes.pdf
4 Table of NPT Thread Sizes http://www.engineeringtoolbox.com/npt-national-pipe-taper-threads-d_750.html
5 Printable fastener sizing layover charts https://www.boltdepot.com/fastener-information/Printable-Tools/Default.aspx
6 All Drill sizes conversion chart http://www.carbidedepot.com/formulas-drillsize.htm
.
***MATERIAL REFERENCES***
1 Sheet metal thickness gage chart http://www.unc.edu/~rowlett/units/scales/sheetmetal.html
2 Custom Spring Calculators-Design the exact spring you need http://www.allrite.com/inventory/design-a-spring
3 Material properties For everything http://www.matweb.com/
.
***ONLINE 3D MODELS***
1 McMaster Carr: wide array of 3d models, go-to for hardware http://www.mcmaster.com/#
2 GrabCAD: Huge database of user submitted models https://grabcad.com/home
3 3DContentCentral:  Database of user submitted models http://www.3dcontentcentral.com/default.aspx
4 Misumi: 3d models of small mechanical parts http://us.misumi-ec.com/
5 3d models of gears http://www.sdp-si.com/eStore/CoverPg/Gears.htm
6 Google Sketchup Model Database https://3dwarehouse.sketchup.com/index.html
.
***SOFTWARE DESIGN TOOLS***
1 Diagram editor: Great for drawing flow charts  http://sourceforge.net/projects/dia-installer/
2 Octave: an opensource alternative to Matlab https://www.gnu.org/software/octave/
3 Draw the floorplan of your house, arrange furniture, see results in 3D. http://www.sweethome3d.com/
4 Electronic Wiring / Analog Circuit CAD http://tinycad.en.softonic.com/
5 Top Rated Free Anti-Virus Software: Avast https://www.avast.com/en-us/lp-ppc-nbu-fav?device=c&ppc=a2&gclid=Cj0KCQiA7dHSBRDEARIsAJhAHwgeBKcKzqaVNR4xTdL03eoSs0J_J24omFHFbo7q6XJzv34iHRIYbxUaAmVpEALw_wcB&gclsrc=aw.ds&dclid=CNPG787Oy9gCFYaOaQodfDkK2w
6 Finds accidentally deleted files.  http://www.piriform.com/recuva
7 Circuit simulator http://www.linear.com/designtools/software/#Ltspice
8 2D Drafting CAD similar to autocad http://www.3ds.com/products/draftsight/download-draftsight/
9 ‘Ccleaner’ computer cleaner and speed booster software http://www.filehippo.com/download_ccleaner/
10 PCB Design software http://www.cadsoftusa.com/
11 Free Parametric 3D modeling software (good for programmers) http://www.openscad.org/
12 Free Ladder Logic Software (the actual PLC is only $70) http://www.automationdirect.com/adc/Overview/Catalog/Software_Products/Programmable_Controller_Software/CLICK_PLC_Programming_Software
13 Desktop Unit conversion  tool https://joshmadison.com/convert-for-windows/
14 Fritzing for documenting arduino & other circuit schematics http://fritzing.org/download/
15 Free online image vectorizer: convert JPEG/PNG to DXF/SVG http://www.autotracer.org/
16 Free online image vectorizer: convert PNG to SVG https://convertio.co/png-svg/
17 Gear Design Tool (Some is free but has paid component too) http://www.woodgears.ca/gear_cutting/template.html
18 Convert SVG to STL: (Thickness ~5mm)  http://svg2stl.com/
19 Free source code editor, useful for programming https://notepad-plus-plus.org/
20 OpenSource Ver of Windows Snipping Tool. (Works on Windows 7 too) http://www.gutmannsoft.com/en/screenshot/capture-screenshot-lite.php
.
***3D PRINTING SOFTWARE TOOLS***
1 Free online 3D model file converter: stl to obj to ply http://www.meshconvert.com/
2 STL File Viewer that lets you make measurements http://www.3d-tool.com/en_free-viewer-download.htm
3 STL FILE Editor: Meshmixer http://www.123dapp.com/meshmixer
4 STL File 3d model Voronoi effect editor: voronator http://www.voronator.com/
5 Slic3r 3D printing slicing software http://slic3r.org/
6 Repetier Host, 3D printing Gcode Generator & Printer UI https://www.repetier.com/download-now/
7 Lathe-R-Beam Spins 2d Drawing around axis & creates STL File https://github.com/makenai/Lathe-R-Beam
8 Cura: Combined slicing, g-code generating, & UI for 3d printers https://ultimaker.com/en/products/cura-software
9 OctoPrint-Remotely monitor your 3D printer http://octoprint.org/
10 Super Simple parametric gear model STL generator http://joostn.github.io/OpenJsCad/
11 Onshape 3d modelling program https://www.onshape.com/
12 TinkerCAD 3D modelling program https://www.tinkercad.com/
13 OPENSCAD Parametric 3D modelling Program http://www.openscad.org/
14 Fusion 360 3D Modelling http://www.autodesk.com/products/fusion-360/students-teachers-educators
15 2.5D control software: CNC Router/laser/ plotter G-code generator & UI  http://www.estlcam.com/
16 Deltabot 3D Printer position calculator http://www.thinkyhead.com/_delta/
17 Laser Web- Free software toolchain for laser cutters & engravers http://hackaday.com/2016/12/23/convert-that-cheap-laser-engraver-to-100-open-source-toolchain/
18 Open Source Vector Graphics Editor (like Adobe Illustrator) https://inkscape.org/en/
19 How to get STL Thumbnail View using Windows Explorer http://www.pragmaticdesigns.com/K-Studio-Demo_x64_1.2.4.0.zip
.
***OUTSOURCING FABRICATION***
1 Find a local DIY 3D printing service www.3dhubs.com
2 Find a local DIY CNC, CAD, or 3D printing service http://www.makexyz.com/
3 Find a local DIY CNC, CAD, 3D printer, Laser fabrication service http://www.100kgarages.com/
4 Online waterjet cutting (Instant free quotes) http://www.bigbluesaw.com/
5 Online laser cutting, 3D printing, & metal machining service. https://www.ponoko.com/
6 Buy bulk Chinese products cheap and resell for profit  http://www.globalsources.com/
7 Buy bulk Chinese products cheap and resell for profit  https://www.aliexpress.com/
8 Timing Belt Center Distance Calculator https://sdp-si.com/eStore/CenterDistanceDesigner
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***OTHER NOTEWORTHY***
1 Learn any language free https://www.duolingo.com/
2 Shorten Long Urls https://bitly.com/
3 Online Stopwatch http://www.online-stopwatch.com/
4 Online super calculator (does algebra too) http://www.wolframalpha.com/
5 Online Interpolation Calculator http://www.johndcook.com/interpolator.html
6 Find websites similar to ones you know you like http://www.similarsites.com/
7 Find books/music/movies similar to ones you know you like https://www.tastekid.com/
8 Google Keep: Free synced notes between computer & phone https://www.google.com/keep/
9 Google Drive: 15Gb Free online data storage https://www.google.com/drive/
10 Find the original URL that’s hiding behind a short URL. https://unfurlr.com/
11 Website Name Availability Checker (Finds similar options for you) http://www.namemesh.com/
12 507 Mechanical Movements: See various linkages in motion  http://507movements.com/
13 Can You run it, automatic system requirements checker for games.  http://www.systemrequirementslab.com/cyri
14 Free OpenSource Password Keeper http://keepass.info/
15 Convert Photo Image to look like a cartoon/drawing http://www.picturetopeople.org/image_effects/photo_cartoon/photo_cartoon.html
16 Internet ruler: Use your computer screen as a ruler. http://iruler.net/
17 Turn any image into a cartoon http://www.picturetopeople.org/image_effects/photo_cartoon/photo_cartoon.html
18 Make your computer screen dimmer if its still too bright http://www.nelsonpires.com/software/dimmer/
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***PERSONAL FINANCE***
1 Simple/Effective Investing Savings Browser Calculator (Dave Ramsey) http://www.daveramsey.com/article/investing-calculator/lifeandmoney_investing/#/entry_form
2 Simple/Effective Home Buy vs Rent Browser Calculator (NYT) http://www.nytimes.com/interactive/2014/upshot/buy-rent-calculator.html?_r=2&&abt=0002&abg=1
3 Free Credit Scoring that doesn’t affect your score to check.  www.creditkarma.com
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***Online Materials Suppliers***
1 Cheap Supplier of various metal raw material  https://www.metalsdepot.com/
2 Cheap Supplier of various metal raw material  https://www.speedymetals.com
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***Engineering/Maker Newsletters***
1 Engineering, design, and business. Interesting & insightful blog articles.  https://www.fictiv.com/blog
2 Instructables newsletter, how to guides & project ideas https://www.instructables.com/
3 Hackster.I.O, hacked hardware projects & ideas.  https://www.hackster.io/
4 Make Magazine standard newsletter http://makezine.com/
5 Maker Pro Newsletter, my favorite one http://makezine.com/tag/maker-pro/
6 Bolt newsletter https://www.bolt.edu.hk/newsletter/
7 Quoras daily digest https://www.quora.com/
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