Here's every resource or upgrade you can collect from planet scanning, listed by galaxy and planet:

SIGURD'S CRADLE

SKEPSIS
Watson - Javelin Missile Launchers
Between Crick and Mass Relay - Wreckage

DECORIS
Laena - Salvage
South between second and third ring - Wreckage

ARCTURUS STREAM

ARCTURUS
Arcturus Station - Intel from battle of Arcturus
West of Themis - Wreckage

EULER
East of Fermi - Wreckage

GEMINI SIGMA

HAN
Underneath Mass Relay - Wreckage
Mavigon - Salvage

MING
Below Antiropus - Wreckage
Parag - Alliance Cruiser Nairobi

HADES GAMMA

ANTAEUS
Just underneath Mass Relay - Wreckage
Trebin - Salvage

PLUTUS
Nonuel - Special Ops Team Zeta, 103rd Marine Division

DIS
Right of the sun - Wreckage
Klensal - Salvage

FARINATA
North of the sun - Wreckage
Juntauma - Alliance Frigate Agincourt

CACUS
Chohe - Salvage
Far North-West - Wreckage

KITE'S NEST

HARSHA
Verush - Weapon Upgrade Kit
Left of Verush - Wreckage
Khar'shan - Artifact: Pillars of Strength

UNTREL
Adek - Salvage
West of Adek - Wreckage

ARGOS RHO

HYDRA
South of the sun - Wreckage
Canrum - Haptic Optics Array

PHOENIX
Pinnacle Station - Turian Spec Ops Team
Intai'sei - Artifact: Fossilized Kakliosaur
North-West of Intai'sei - Wreckage

GORGON
Camaron - Advanced Power Relays

APIEN CREST

CASTELLUS
South of Fiax, East of Nius - Wreckage
Digeris - Artifacts: Banner of the 1st Regiment

GEMMAE
Pheiros - Turian 79th Flotila
South of Pheiros - Wreckage
West of Pheiros - Wreckage

AETHON CLUSTER

ARU
Irune - Artifacts: Book of Plenix
West of Irune - Wreckage
Cherk Sab - Volus Fabrication Units

ESORI
Solu Paolis - Volus Dreadnought Kwonu
East of the sun - Wreckage

SATU ARRD
Nalisin - Volus Engineering Team
South-West of the sun - Wreckage

NURA
Oma Ker - Volus Intelligence Archives
North of the sun - Wreckage

ATTICAN BETA

HERCULES
Eletania - Interferometric Array
South-East of the sun - Wreckage

THESEUS
Feros - ExoGeni Scientists
North-west of the sun - Wreckage

THE SHRIKE ABYSSAL

XE CHA
Zada Ban - Salvage
South of the sun - Wreckage

URLA RAST
Talis Fla - Artifact: Prothean Obelisk
North-West of the sun - Wreckage

VALHALLAN THRESHOLD

RAHEEL-LEYYA
North-East - Wreckage

PAZ
Garvug - Artifact: Prothean Data Drives
East of the sun - Wreckage

MICAH
Elohi - Emergency Fuel Pods
Farlas (East, in asteroid belt) - Element Zero Convertor
South-East of the sun - Wreckage

HADES NEXUS

HEKATE
South-West of Mass Relay - Wreckage
Asteria - Alliance Frigate Hong Kong, Alliance Fifth Fleet

HOPLOS
Kopis - Artifact: Obelisk of Karza
Far West - Wreckage

SHEOL
Gei Hinnom - Artifact: Prothean Sphere

PAMYAT
Dobrovolski - Alliance Friage Leipzig, Alliance First Fleet
South of the sun - Wreckage

MINOS WASTELAND

FORTIS
Pietas - Salvage
South of Mass Relay - Wreckage

EXODUS CLUSTER

UTOPIA
South of Eden Prime - Wreckage
Zion - Prothean Data Files

ASGARD
Borr - Remains of Reaper Destroyer
Tyr - Alliance Naval Exploration Flotilla
Terra Nova - Alliance Cruiser Shanghai
Loki - Alliance Spec Ops Team Delta
North-East of the sun - Wreckage

SILEAN NEBULA

KYPALADON
Hanalei - Dr. Jelize

TEYOLIA
Nevos - Artifact: Rings of Alune
Quirezia - Salvage
East of the sun - Wreckage

PHONTES
Dekuuna - Artifact: Code of the Ancients
Oltan - Elcor Flotilla
East of Lenamund - Wreckage

NAHUALA
Hyetiana - Serrice Guard
South-West of Agessia - Wreckage

LOROPI
East of Wreckage - Wreckage
Yasilium - Armali Sniper Unit

NIMBUS CLUSTER

PELION
South of Aitis - Wreckage
Trategos - Intact Reaper Weapon
Just North-East of Trategos - Wreckage
Just North-West of Sthenia - Wreckage

AGAIOU
Carcosa - Artifact: Library of Asha

KALLINI
South of Pania - Wreckage

NUBIAN EXPANSE

DAKKA
Pragia - Research Data from Pragia
South-East of the sun - Wreckage

QERTASSI
Norehsa - Alliance Frigate Trafalgar
North of Norehsa - Wreckage

KALABSHA
Yamm - Alliance Marine Recon Unit, 103rd Marine Division
North-East of the sun - Wreckage

HOURGLASS NEBULA

OSUN
Erinle - Salvage
South-West of Erinle - Wreckage

FARYAR
Alingon - Shadow Broker Starship Tech
Next to Alingon - Wreckage

SOWILO
Hagalaz - Shadow Broker Support Team
North of the sun - Wreckage

PLOITARI
Zanethu - Terminus Freighters

ATHENA NEBULA

PARNITHA
Tevura - Asari Cruiser Cybaen

ORISONI
Egalic - Asari Research Ships
East of the sun - Wreckage

TOMAROS
South of Niagolon - Wreckage
Pronoia - Asari Cruiser Nefrane

VERNIO
Polissa - Artifact: Hesperia Period Statue
North-West of the sun - Wreckage

IALESSA
West of the sun - Wreckage
Trikalon - Asari Engineers

ISMAR FRONTIER

AQUILA
Metaponto - Advanced Biotic Implants