Just like sAks, I'm a fan of the original addon by Aezay (Examiner; SuperInspect by Chester). Because the original version of Examiner no longer functions (and because sAks' version isn't compatible with MoP Classic), I extensively modified and extended it for WoW Classic, Burning Crusade Classic, and MoP Classic.

Examiner for Classic WoW, Burning Crusade Classic, and MoP Classic

Now availabile for Classic WoW and BCC Anniversary edition. Largely re-worked to function the same as Aezay's original mod from the same era.

Description
With Examiner, you can check other players gear, talents, achievements, honor and arena team details.

When you inspect someone, it will show a stat summery of all their equipped gear combined. Please note that these values are from gear alone, and will not include bonuses from buffs, talents or normal base stats.

Each player you inspect can be cached, that way you can look them up later, even when they are not around. The option to cache others is disabled by default, you will have to enable caching on the "Config" page.

You can bind a key to inspect your target, you can even bind a key to inspect whoever is under your mouse, without having to target anyone (stealth inspection). To set this up, open the Key Bindings dialog and look under "Examiner" or "Other".

Examiner does not use that much memory by itself, but once you start caching a lot of people, memory usage can grow quite quickly.

Special Thanks
Aezay, the original author of Examiner.
sAks/eusi, author of the SoD Classic variant of Examiner
Chester, the original author of SuperInspect, who gave me the idea to make this mod.
Haldamir of Gorgonnash, for the German translation.
Qcat0214, who made the Chinese translation for the 1.13.2 patch.
omosiro, who made the Korean translation.
chkid, for Korean translation update for the 1.13.2 patch.
g3gg0, changes to the German translation & author to one of the SuperInspect versions.
Pettigrow of Sinstralis, for the translation to French.
Siphony of EU-Onyxia, updated German translation.
Dridzt, for some of the required changes in the WotLK to make it function properly again.
quicksylver, for updating the English patterns to WotLK.
Darigaaz of SoulFlayer(RU) for the Russian translation.
Hoofik of AshenVale for the 3.0 patch update of the Russian translation.
Maxfunkey (aka Carambha of EU-Lordearon), patch 3.0.2 update of the German and Frensh translation.
Thorakon (aka Pulgrim of EU-Alexstrasza), for the patch 3.0.3 update of the German translation.
ericyen, for the Taiwan translation for the 3.1 release.
eusi, for the updated talent module in Mists of Pandaria.
ywfn, for making the PvP module work with all pvp and battleground changes.
fallendos, for an update to the Korean patterns.
Netrox, for the help in updaing the talents module for WoD.
Cidrei, updates to the GetUpgradedItemLevel lib to fix itemLevels for Timewarped items.
Valmere for ZG enchants and more.
vanillalad for Details talents implementation and AQ enchant (enUS).
Tichondrius (US-PvP), for being my home for over 20 years.

All the people using Examiner!

Original version (By Aezay): https://www.curseforge.com/wow/addons/examiner
SoD Fan Update (By sAks): https://www.curseforge.com/wow/addons/examiner-classic-sod

All the best,

Luminayre/Luminair

Examiner (SuperInspect) for WoW, TBC, and MoP Classic