I’m looking for a Shoutbox (Sidebar) Plugin

your options might have been to have checked the plugins listed here: https://codex.www.ads-software.com/Plugins

heres another widely used option, it’s called Google: https://www.google.com/search?hl=en&q=wordpress+shoutbox&btnG=Google+Search

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According to the Nielsen cabinet, Google is the most popular search engine on the web with a 54% market share, ahead of Yahoo! (23%) and MSN (13%). However, independent estimates from popular sites indicate that more than 80% of search referrals come from Google, with Yahoo! a distant second and MSN occupying barely 5%. It receives about a billion search requests per day.