Holley EFI
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Holley's site blocks automated checks; new versions are added by hand.
Runs: Holley Terminator X (550-903, LS1/LS6 24x), Holley Terminator X Max (550-916, LS1/LS6 with 4L60E/4L80E), Holley HP EFI ECU (554-113), Holley Dominator EFI ECU (554-114) (Terminator X, HP, Dominator)
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Check the SHA-256 after downloading. Install the version your ECU's firmware needs: a newer PC application does not always talk to older firmware.