Web, Network, Security & Finance

C

CompaniesMarketCap

Free

Rank and compare every public company by market cap, revenue, and P/E

L

LeakCheck

Freemium

Search breach datasets by email, username, or domain for leaked records

M

Macrotrends

Free

Chart decades of stock fundamentals and macro indicators for free

C

CoinGecko

Freemium

Prices, exchanges and on-chain data for 10,000+ cryptocurrencies

N

Ninite

Free

Bundles Windows apps into one installer for bulk, toolbar-free setup (a must for new PCs)

T

ToS;DR

Free

Summarizes terms of service and privacy policies with A–E grades and red flags

J

JustDeleteMe

Free

Find direct links and difficulty ratings for deleting your online accounts

C

Carrd

Freemium

Build a one-page responsive site in minutes

T

Trading Economics

Freemium

GDP, inflation and rates for 196 countries plus commodities, FX and stock dashboards

B

Bitwarden

Freemium

Open-source password manager (free, self-hostable)

Y

YellKey

Free

Shorten URLs into memorable common English words for quick sharing

O

Office Holidays

Free

Check public holidays and bank holidays for every country and year

A

archive.today

Free

Save a permanent snapshot of a web page at a specific moment

Q

QRCode Monkey

Free

Generate high-resolution custom QR codes with your logo and colors

T

TinyURL

Free

Shorten and customize long URLs with no signup

I

Instant Domain Search

Free

Shows domain availability and pricing as you type

W

WhatIsMyIPAddress

Free

Check your public IP, location and blacklist status

G

goQR.me

Free

Generate and decode QR codes with no signup, plus API

N

Numbeo

Free

Compare cost of living, housing, prices and safety across world cities

I

Is It Down Right Now

Free

Check whether a site is down for everyone or just for you

B

BuiltWith

Freemium

Enter any site to look up its CMS, analytics and hosting tech stack

H

Have I Been Pwned

Free

Check whether your email or password was part of a data breach

F

FRED

Free

800,000+ economic time series from the St. Louis Fed

F

Fast.com

Free

Netflix's ultra-simple internet speed test

D

DNSChecker

Free

Instantly check DNS propagation status from nodes worldwide

D

DownDetector

Free

Check service outages in real time via user reports and graphs

O

OpenSpeedTest

Free

Open-source HTML5 speed test (embeddable, self-hostable)

Z

ZXing Decoder

Free

Decode QR codes and barcodes from any uploaded or linked image

Q

QiFi

Free

Generate Wi-Fi QR codes locally in your browser without sending your password

S

Security Headers

Free

Grades a site's security response headers from A to F

S

SSL Labs Server Test

Free

In-depth SSL/TLS diagnosis of a domain graded A+ to F (the standard)

W

World Time Buddy

Freemium

Compare time zones visually and schedule meetings across cities

G

GTmetrix

Freemium

Reports on performance scores, waterfalls and improvement tips

W

WebPageTest

Freemium

In-depth performance testing from multiple locations and real devices, down to the loading waterfall

I

intoDNS

Free

Reports errors in a domain's DNS and mail configuration

D

DQYDJ

Free

Calculate S&P 500 returns, income percentiles, and dozens of finance metrics

N

Namechk

Free

Bulk-check where a desired username or domain is still available

W

who.is

Free

Look up a domain's whois, registration details and DNS

P

PageSpeed Insights

Free

Diagnose page performance with Google Core Web Vitals

M

MXToolbox

Freemium

Diagnose MX, blacklists, DNS and SMTP all at once

M

Marginalia Search

Free

Open-source search engine that surfaces non-commercial, old and small websites (an ad-bypassing search booster)

W

Wise Currency Converter

Free

Convert 140 currencies at the mid-market rate with 5-year history and alerts

R

REDbot

Free

Checks HTTP headers and cacheability ('lint for HTTP')

M

Mail.tm

Free

Instant disposable temporary email with no signup or captcha, plus API

U

urlscan.io

Freemium

Opens suspicious URLs in a sandbox to analyze redirects and screenshots (phishing check)

W

WhereGoes

Free

Trace every redirect hop of a shortened or suspicious URL

P

Proton

Freemium

E2E-encrypted mail, calendar, drive and VPN

V

VirusTotal

Freemium

Scan files and URLs with 70+ antivirus engines at once

G

GRC ShieldsUP!

Free

Scans your IP for open ports to diagnose your firewall (keeps no data)

F

Finviz

Freemium

Free U.S. stock screener with heatmaps, scanner and economic calendar