It is an easy way to embed large image in a small space. Suppose you have an emage in 1200 PX Width and 900 PX height image and you have place it in 600 PX width space, you will lock its aspect ratio and the person will open image in another page to see it in large. Bigimg will use a java script and you will be able to zoom in and zoom out the image just use mouse pointer to see invisible parts of image.
frequency is a video feed site, you can follow your favorite channels, so their videos will be in your feed.
You can easily create Facebook banners, it is also for new profile but it is not for profile picture, but it is for latest pictures tagged with your name, that you see on your profile in middle.
Initializr is a template generator for HTML5. Using initializr you can create HTML 5 web pages. HTML 5 is latest HTML standard approved by W3.
You can see daily 12 best videos on the internet. These videos are handpicked, hottest and fresh.
Fourerr is a marketplace, here you can give or get any service for only $4. You can sell or buy skills or products for only $4.
Penio is an online publishing program, you can create beautiful text based pages in seconds and share them with the world. No sign up o login. But it is not a blogging platform because every page will have it is own subdomain.
You can easily take pols online with gopollgo. You can easily create online polls. You can share your polls on Twitter and Facebook or embed it on blogs and websites.