LanguageTool’s multilingual grammar, style, and spell checker.
Miscellaneous, Text, Validation- 3D (2)
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Validation
Responsive Email CSS InlinerGo!
Bring Your Email Styles Inline. Use the Foundation for Emails Inliner to do it.
Marketing, Validation
CrittercismGo!
Crash reports tools. Crittercism helps you deliver an exceptional mobile experience.
Android, iOS, Validation
HockeyAppGo!
Collect live crash app reports, get feedback from your users and beta distribution.
Android, iOS, Mobile, Validation
MobilizerGo!
Website responsive design testing on real devices. Screenshot generator.
Mobile, Responsive, Validation
UberlayerGo!
Design to the pixel putting floating images on top of your computer screen. Mac only.
Design, Validation
PrismGo!
Prism Multi-Device Web Proxy. Test multiple different devices, simultaneously.
Mobile, Responsive, Validation
CompsGo!
Load images and easily overlay them onto your website for comparing against a given design.
Validation, Web design
Usability checklistGo!
Usability checklist, which can be used to quickly catch common usability issues on websites.
UX, Validation