XSane

Clam AntiVirus   (Compare Project)

Mostly written in C

License: gpl

Flex   (Compare Project)

License: BSD-3-Clause

SANE (Scanner Access Now Easy)   (Compare Project)

Mostly written in C

License: gpl

Zed Attack Proxy   (Compare Project)

Mostly written in Java

License: apache_2

OWASP OWTF   (Compare Project)

Mostly written in Python

License: BSD_License

Greenbone Vulnerability Management (GVM) Framework   (Compare Project)

Mostly written in C

License: AGPL3_or_later, GNU_General_Public_License_v2_0_only, gpl, gpl3_or_later

Umit Project   (Compare Project)

Mostly written in C++

License: gpl, lgpl

MailScanner   (Compare Project)

Mostly written in Perl

License: Unknown

re2c   (Compare Project)

Mostly written in C

License: Public_Domain

Simple Scan   (Compare Project)

Mostly written in Vala

License: gpl3_or_later