GNUnet is GNU's framework for secure peer-to-peer networking. It is described as a network protocol stack for building secure, distributed and privacy-preserving applications, aiming to replace the existing Internet protocol stack, and is free software.
MalShare is a community-driven public malware repository that provides free access to malware samples and tooling for the information security community. The site lists recently added samples with SHA256 hashes, file types and submission sources, and offers upload, search, download and API sections along with registration.
Cap is a free, open-source, self-hosted CAPTCHA alternative. It uses proof-of-work and JavaScript instrumentation challenges instead of visual puzzles, and is licensed under Apache 2.0. It is installed by running a server with Docker and adding a widget to a form.
Nmap is a free open source security scanner and network exploration tool available for Linux, Windows, UNIX and FreeBSD. Its documentation includes a reference guide covering command-line arguments, port scanning techniques, firewall and IDS evasion, and timing and performance, with the man page translated into 15 languages.
ZeroSSL is a certificate authority offering free 90-day SSL certificates and premium annual certificates. It supports automated issuance and renewal via ACME clients and a REST API, plus one-step validation, wildcard and multi-domain certificates, installation checks and SSL monitoring.
DNSWatch offers DNS lookup and reverse DNS lookup tools with exact performance measuring and DNS server monitoring. It also provides RBL email blacklist lookup and IP location lookup. Paid products include DNS performance monitoring starting at $1 per month, mailserver blacklist monitoring starting at $3.5 per month, and a DNS changetracker starting at $7.9 per month. The site is free to use with ads.
DNSHistory is a developer resource for coding, documentation, communities, security research, or software tools.
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MalShare is a community-driven public malware repository that provides free access to malware samples and tooling for the information security community. The site lists recently added samples with SHA256 hashes, file types and submission sources, and offers upload, search, download and API sections along with registration.
Cap is a free, open-source, self-hosted CAPTCHA alternative. It uses proof-of-work and JavaScript instrumentation challenges instead of visual puzzles, and is licensed under Apache 2.0. It is installed by running a server with Docker and adding a widget to a form.
Nmap is a free open source security scanner and network exploration tool available for Linux, Windows, UNIX and FreeBSD. Its documentation includes a reference guide covering command-line arguments, port scanning techniques, firewall and IDS evasion, and timing and performance, with the man page translated into 15 languages.
ZeroSSL is a certificate authority offering free 90-day SSL certificates and premium annual certificates. It supports automated issuance and renewal via ACME clients and a REST API, plus one-step validation, wildcard and multi-domain certificates, installation checks and SSL monitoring.
DNSWatch offers DNS lookup and reverse DNS lookup tools with exact performance measuring and DNS server monitoring. It also provides RBL email blacklist lookup and IP location lookup. Paid products include DNS performance monitoring starting at $1 per month, mailserver blacklist monitoring starting at $3.5 per month, and a DNS changetracker starting at $7.9 per month. The site is free to use with ads.
DNSHistory is a developer resource for coding, documentation, communities, security research, or software tools.
