AdGuard is described as 'The best way to get rid of intrusive ads and online tracking, and to protect your computer from malware. Make your web surfing faster, safer and more comfortable with AdGuard!' and is a very popular Ad Blocker in the security & privacy category. There are more than 100 alternatives to AdGuard for a variety of platforms, including Google Chrome, iPhone, Mac, iPad and Windows apps. The best AdGuard alternative is uBlock Origin, which is both free and Open Source. Other great apps like AdGuard are Adblock Plus, Portmaster, NextDNS and SponsorBlock.
AdGuard alternatives are mainly Ad Blockers, but if you're looking for
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Adguard and Netguard show as alternatives to each other but I don't think they can be alternatives to each other in an almost exact way. Netguard networks your traffic, it's a firewall; I use adguard as an adblocker mostly by using it from private dns. They can be quite similar in some ways but I use them both for their special roles.