dpkg

Aptitude   (Compare Project)

Mostly written in C++

License: gpl

Synaptic Package Manager   (Compare Project)

Mostly written in C++

License: gpl

alien   (Compare Project)

Mostly written in Perl

License: gpl

Lintian   (Compare Project)

Mostly written in Perl

License: gpl

pkg++   (Compare Project)

Mostly written in Lua

License: BSD-3-Clause, gpl3

aptly   (Compare Project)

Mostly written in Go

License: mit

Debreate - Debian Package Builder   (Compare Project)

Mostly written in Python

License: mit, QTail

debexpo   (Compare Project)

License: mit

apt-venv   (Compare Project)

Mostly written in Python

License: gpl3

apt - Advanced Package Tool   (Compare Project)

Mostly written in C++

License: gpl