Acunetix is not available for Linux but there are plenty of alternatives that runs on Linux with similar functionality. The best Linux alternative is OWASP Zed Attack Proxy (ZAP), which is both free and Open Source. If that doesn't suit you, our users have ranked more than 25 alternatives to Acunetix and 16 are available for Linux so hopefully you can find a suitable replacement. Other interesting Linux alternatives to Acunetix are Burp Suite, OpenVAS, Nessus and Nikto.
Acunetix is mainly a Vulnerability Scanner but alternatives to it may also be WAFs. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of Acunetix.
The Nessus vulnerability scanner is the world-leader in active scanners, featuring high-speed discovery, configuration auditing, asset profiling, sensitive data discovery and vulnerability analysis of your security posture.
Nikto is an Open Source (GPL) web server scanner which performs comprehensive tests against web servers for multiple items, including over 6400 potentially dangerous files/CGIs, checks for outdated versions of over 1000 servers, and version specific problems on over 270 servers.
Most users think Nikto is a great alternative to Acunetix.