The best alternatives to Search Aggregate are Learn Anything, Glimpse, and Hey Meta. If these 3 options don't work for you, we've listed a few more alternatives below.
Meta tags enable search engines, social networks, and messaging services get the required information from your website and display it in a visual way instead of just a plain old link. Hey Meta helps you generate those meta tags by editing your existing ones or writing new ones which you generate and easily place on your website.
Search multiple websites at once with Resulttree. Write the search term once, and open some or all websites at once. No more copy and paste the search term on each websites.