Firefish is another fediverse microblogging platform and it has search and quote tweets, but you can’t follow hashtags in your regular timeline (you can set up a separate timeline called an antenna that regularly pulls in posts according to a list of words or hashtags you specify). It also has a tweet deck style layout you can setup and you can easily follow and be followed by mastodon users from a firefish account.

There are other alternatives as well, but this is the one I am most familiar with.