systemtap

elfutils   (Compare Project)

Moderate Activity

Mostly written in C

License: GPL-2.0+, GPL-3.0+, LGPLv3+

Cacti   (Compare Project)

High Activity

Mostly written in PHP

License: GPL-2.0+

Sanet   (Compare Project)

Moderate Activity

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License: AGPL

Cricket   (Compare Project)

Inactive

Mostly written in Perl

License: Unknown

Opsview Core   (Compare Project)

Activity Not Available

Mostly written in Perl

License: GPL-2.0+

KEDR Framework   (Compare Project)

Moderate Activity

Mostly written in C

License: GPL-2.0+

Webmin System stats   (Compare Project)

Very Low Activity

Mostly written in Perl

License: GPL-2.0+

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Activity Not Available

License: GPL-2.0+

OpenNMS   (Compare Project)

Very High Activity

Mostly written in Java

License: GPL-3.0

ScopePort   (Compare Project)

Activity Not Available

Mostly written in JavaScript

License: GPL-3.0+

frysk   (Compare Project)

Inactive

Mostly written in Java

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Moderate Activity

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License: Unknown

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Moderate Activity

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License: GPL-2.0+

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Very High Activity

Mostly written in C

License: GPL-2.0+

DejaVu fonts   (Compare Project)

Very Low Activity

Mostly written in Perl

License: Arev Fonts Copyright, Bitstream Vera Fonts Copyright, PD/GWC

GNU Aspell   (Compare Project)

Very Low Activity

Mostly written in C++

License: LGPL

Gawk   (Compare Project)

Activity Not Available

Mostly written in C

License: GPL-2.0+

GNU binutils   (Compare Project)

Very High Activity

Mostly written in C

License: GPL-3.0

GDB   (Compare Project)

Very High Activity

Mostly written in C

License: GPL-3.0+

mutt   (Compare Project)

Low Activity

Mostly written in C

License: GPL-2.0+