LibreNMS is a fork of [Observium][1].  Observium was written by:
- Adam Armstrong
- Tom Laermans
- various others as indicated in the file contents and commit logs

Contributors to LibreNMS:
- Paul Gear <github@libertysys.com.au> (paulgear)
- Neil Lathwood <neil@lathwood.co.uk> (laf)
- Daniel Preussker <f0o@devilcode.org> (f0o)
- Bohdan Sanders <git@bohdans.com> (bohdan-s)
- Toni Cunyat <elbuit@gmail.com> (elbuit)
- Tuomas Riihimäki <tuomari@iudex.fi> (tuomari)
- Søren Friis Rosiak <sorenrosiak@gmail.com> (rosiak) 
- Mike Rostermund <mike@kollegienet.dk> (saaldjormike)
- Nicolas Armando <nicearma@yahoo.com> (nicearma)
- Micah Chasteen <mjchasteen@gmail.com> (mchasteen)
- Kevin Fleshman <fleshmank@hotmail.com> (KFleshman)
- Markus Heberling <markus@tisoft.de> (tisoft)
- Alan Gregory <alan@opcaonet.com.br> (alangregory)
- Joubert RedRat <me+github@redrat.com.br> (joubertredrat)
- Len Lin <Ultra2D@users.noreply.github.com> (Ultra2D)
- Christopher Freas <code@packetbusters.net> (nwautomator)
- Stuart Henderson <stu@spacehopper.org> (sthen)
- Filippo Giunchedi <filippo@esaurito.net> (filippog)
- Lasse Leegaard <lasse@brandbil.dk> (lasseleegaard)
- Mickael Marchand <mmarchand@corp.free.fr> (mmarchand)
- Mohammad Al-Shami <mohammad@al-shami.net> (mohshami)
- Rudy Hardeman <zarya@gigafreak.net> (zarya)
- Arjit Chaudhary (arjit.c@gmail.com) (arjitc)
- Freddie Cash (fjwcash@gmail.com) (fjwcash)
- Thom Seddon <thom@seddonmedia.co.uk> (thomseddon)
- Vitali Kari <vitali.kari@gmail.com> (vitalisator)
- James Campbell <neokjames@gmail.com> (neokjames)
- Steve Calvário <calvario.steve@gmail.com> (Calvario)
- Christian Marg <marg@rz.tu-clausthal.de> (einhirn)
- Louis Rossouw <lrossouw@gmail.com> (spinza)
- Clint Armstrong <clint@clintarmstrong.net> (clinta)
- Tony Ditchfield <tony.ditchfield@gmail.com> (arnoldthebat)
- Travis Hegner <travis.hegner@gmail.com> (travishegner)
- Will Jones <email@willjones.eu> (willjones)
- Job Snijders <job@instituut.net> (job)
- Rasmus Aberg <rasmus@sthix.net> (rasssta)
- Jan Saner <jan@trick77.com> (trick77)
- Mikhail Bratchikov <mbratchikov@odin.com> (pepyaka)

[1]: http://observium.org/ "Observium web site"