Enlaces de interés

Linux

• Crontab Guru – The quick and simple editor for cron schedule expressions by Cronitor

PHP

• Live Regex – A Live Regular Expression Tester for PHP

CSS

• BootStrap – Build fast, responsive sites with Bootstrap
• Font Awesome – icon library
• CSS matic – The ultimate CSS tools for web designers

Optimización

• Google Search Console – Mejora tus resultados en la Búsqueda de Google
• Google PageSpeed tools – Analyze and optimize your website
• Prueba de optimización para móviles
• GTmetrix – How fast does your website load?

Utilidades

• HTML Arrows – offers all the html symbol codes you need to simplify your site design
• Unicode characters – Compart – a site dedicated to Unicode and all things related to Unicode, characters, glyphs and internationalization.

MAIL

• MinuteInBox – Disposable 10 Minute Email Address
• 10 Minute Mail – Correo de 10 minutos.

RED

• DNSlytics – The ultimate online investigation tool
• BlackLists Check – The blacklist check will test a mail server IP address against over 100 DNS based email blacklists
• Verify Email – email verification tool actually connects to the mail server
  and checks whether the mailbox exists or not

DISEÑO

• Free pngimg – PNG images and cliparts for web design
• Pixabay – Stunning free images & royalty free stock
• freedesignfile – Free Vector, Stock Photos, PSD File, Free Icons and Fonts
• freepik – Find Free Vectors, Stock Photos, PSD and Icons
• SoftIcons – Free icons sets