All of these are widely available on unblocked sites and scratch the same slingshot itch.
Because Angry Birds is a physics-based puzzle game rather than a violent shooter or high-bandwidth MMO, it is a perfect candidate for unblocked gaming portals. Unblocked Games Angry Birds
A robust browser extension will block intrusive pop-ups, malicious redirects, and scripts that slow down your computer. All of these are widely available on unblocked