Apps with 'Webmaster-tools' feature
Google Webmaster Tools provides you with detailed reports about your pages' visibility on Google.
GTmetrix is a free online tool that analyzes your page's speed performance.
StatusCake.com is a free website monitoring tool which allows users to track up to 10 websites and get alerted when their site is down or is having trouble.
DareBoost is an online tool to test, analyze and monitor your website: speed, SEO, quality, security. All you need for website optimization in a single service.
Website monitoring service that offers a comprehensive free plan with:
World's largest marketing/webmaster community. Includes large collection of tools.No screenshots yet
A curated collection of the best SEO tools, split into categories and collections.
Drive more visitors to your site using Bing data on search queries, crawling and search traffic.No screenshots yet
Uptime, Service Health and Performance Monitoring
WebToolHub.com is a dedicated portal for people looking for extensive webmaster and seo tools at one place at no cost.No screenshots yet
Use webapps or browse the web in a clean, distraction-free environment with VBWebApps.
Detecting end-user browser details, so web developers and customer service agents don't have to ask their clients about browser version, operating system, etc.
This tool generates CSS gradient code using an easy to use graphical interface. It supports different options from simple linear to complex radial gradients.
Extension for Google Chrome with the best online tools for SEO, web development and design.
I frequently update this extension to include the best resources to increase productivity and save time.
AgentSlug.com is simple but perspective application to monitor your website. For now, you can find there a full featured uptime monitoring tool.