The Best Spur Alternatives in 2026

Zeek analyzes network activity through an open source monitor with a flexible scripting language.

Block internet access per Android app with NetGuard, a firewall that does not require root.

SSL Labs provides tools for testing SSL and TLS configurations and related public key infrastructure.

CheckFileType identifies unknown files without extensions by analyzing their contents.

Manage Windows Firewall rules and receive outbound connection notifications with Windows Firewall Control.

The Hitch proxy handles TLS connections for Varnish and is described by its project as open source.

Proxy Check provides a proxy detection API for identifying proxy connections used in online services and game servers.

IPv6 Leak Test checks whether a device has IPv6 connectivity and displays connection information related to privacy.

Discover hosts and map networks with Nmap, a network exploration and security scanning tool.

Kismet monitors and captures Wi-Fi network traffic, with wireless intrusion detection and wardriving features.

Explore ntop’s network visibility and cybersecurity offering; the supplied page gives little further detail.

Superagent provides an autonomous security platform for testing applications, repositories, agents, and infrastructure.

Octane analyzes application code to find exploitable security vulnerabilities and trace attack paths.

Karma Firewall is an Android firewall that states it requires no internet permission and intercepts no allowed user traffic.

Terminate TLS connections through Hitch, a scalable TLS proxy from Varnish Software.

Manage two-factor authentication codes with OTP Auth, an iOS app listed on the App Store.

Generate secure SSL configurations for selected web, database, and mail software.

Configure network activity rules through Windows Filtering Platform with Simplewall.

Set network rules by application or globally with Fort Firewall for Windows.

Scan TCP ports with masscan, an asynchronous scanner designed for large network ranges.

Scan applications, APIs, networks, DNS, and cloud configurations for vulnerabilities using Nuclei.

Solve reverse engineering challenges published on challenges.re, a challenge-focused site.

GoPlus offers Web3 security tools including audits, APIs, a user security hub, and a browser extension.

Search the National Vulnerability Database, a public resource for vulnerability information.