Every engine in the Auncient VM — the executable-stack computer Maria is building
across the Atropa ecosystem. Each entry is taken from the commit that shipped it,
and where that commit states a cost, the gas-per-operation figure here is quoted
from it verbatim and links back to the sentence it came from. Engines shipped
without a stated figure are listed as unmeasured rather than given one. From SMALGOL-61 stack machines and
ALGOL/COBOL transpilers to EDSAC/AUTODIN
compilers, firewalls and numerical synthesizers. Measured engines first, cheapest-first.