Links:

You’re in lu best of the internet ck! 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 & https://engineerdog.files.wordpress.com/2022/09/weldingsymbols.png
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/
	.
	*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
	.
	*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
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
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
	.
	*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/
	.
	*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
	.
	*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
	.
	*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/
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