Items in Blue are accesed through dropdown menus.
Items in Green are checkboxes that can be toggled.
The keywords are the items that in Orange that appear in the Gaussian Input File.

Job Type Tab
Job Type => Optimizationopt
Use RFO stepopt=rfo
Use Quadratic Macrostepopt=quadmac
Use tight convergenceopt=tight
Optimize to a => TS (Berny)opt=ts
Optimize to a => TS (QST2)opt=qst2
Optimize to a => TS (QST3)opt=qst3
Force Constants => Calculate at First Pointopt=calcfc
Force Constants => Calculate at all Pointsopt=calcall
Force Constants => Read Internalopt=readfc
Force Constants => Read Cartesianopt=rcfc
Job Type => Frequencyfreq
Compute VCDfreq=vcd
Save Normal Modes Optionsfreq=savenormalmodes
Skip diag. of full matrixfreq=nodiagfull
Select Normal Modesfreq=selectnormalmodes
Anharmonic Correctionsfreq=anharmonic
Specify Anharmonic Modes freq=selectanharmonicmodes
Compute projected frequenciesfreq=projected
Compute Raman => Nofreq=noraman
Compute Raman => Yesfreq=raman
Compute ROA => Yesfreq=roa
Read Incident Light Freqs => Yesfreq cphf=rdfreq
Read Incident Light Freqs => Nofreq cphf=noread
Job Type => Opt+Freqopt freq
Use RFO stepopt=rfo freq
Use tight convergence criteriaopt=tight freq
Compute VCDopt freq=vcd
Save Normal Modes Optionsopt freq=savenormalmodes
Skip diag. of full matrixopt freq=nodiagfull
Select Normal Modesopt freq=selectnormalmodes
Anharmonic Connectionsopt freq=anharmonic
Specify Anharmonic Modes opt freq=selectanharmonicmodes
Optimize to a => TS (Berny) opt=ts freq
Force Constants => Calculate at First Point opt=calcfc freq
Force Constants => Calculate at all Points opt=calcall freq
Force Constants => Read Internal opt=readfc freq
Force Constants => Read Cartesian opt=rcfc freq
Compute Raman => Noopt freq=noraman
Compute Raman => Yesopt freq=raman
Compute ROA => Yesopt freq=roa
Read Incident Light Freqs => Yes opt freq cphf=rdfreq
Read Incident Light Freqs => Noopt freq cphf=noread
Job Type => IRCirc=calcfc
Do IRCMax calculationircmax=calcfc
Compute more points, N= irc=maxpoints=n
Recalculate Force Constants Every nth Point, n = irc=recalc=n
Follow IRC => Forward only irc=forward
Follow IRC => Reverse only irc=reverse
Force Constants => Calculate Alwaysirc=calcall
Force Constants => Read from .CHKirc=rcfc
Recorrect Steps => Never irc=recorrect=never
Recorrect Steps => Yes irc=recorrect=yes
Recorrect Steps => Always irc=recorrect=always
Recorrect Steps => Test irc=recorrect=test
Job Type => Scan => Rigidscan
Job type => Relaxed (Z-Matrix)opt=z-matrix
Job type => Scan, Relaxed (Redundant Coord)opt=modredundant
Job type => Stabilitystable
Reoptimize the wavefunctionstable=opt
Job Type => NMR nmr=giao
CSGT Methodnmr=csgt
IGAIM Methodnmr=igaim
CSGT, IGAIM and Single Originnmr=all
Compute spin-spin couplings (for all atoms) nmr=spinspin
NMR=mixednmr=mixed
Method Tab
Method => Mechanics => UFFuff
Method => Mechanics => Dreidingdreiding
Method => Mechanics => Amberamber
QEq Charges => All Atomsmethod=qeq
QEq Charges => Untyped Atomsmethod=untyped
QEq Charges => Uncharged Atomsmethod=uncharged
Method => Restricted R prefix
Method => Unrestricted U prefix
Method => Restricted-Open RO prefix
Method => Semi-empirical => PM6pm6
Method => Semi-empirical => PDDGpddg
Method => Semi-empirical => AM1am1
Method => Semi-empirical => PM3pm3
Method => Semi-empirical => PM3MMpm3mm
Method => Semi-empirical => INDOindo
Method => Semi-empirical => CNDOcndo
Method => Hartree-Fockhf
Method => DFT => LSDAlsda
Method => DFT => BVP86bvp86
Method => DFT => B3LYPb3lyp
Method => DFT => CAM-B3LYPcam-b3lyp
Method => DFT => B3PW91b3pw91
Method => DFT => MPW1PW91mpw1pw91
Method => DFT => PBEPBEpbepbe
Method => DFT => HSEH1PBEhseh1pbe
Method => DFT => HCTHhcth
Method => DFT => TPSSTPSStpsstpss
Method => DFT => WB97XDwb97xd
Method => DFT => APFDapfd
Method => MP2mp2
Method => MP4mp4(sdtq)
Include all electronsmethod=full
Method => CCSDccsd
Read Amplitudes ccsd=readamplitudes
Save Amplitudes ccsd=saveamplitudes
Method => BDbd
Method => CASSCF casscf
RFO Quadratic Step casscf=rfo
Method => Compound => CBS-4Mcbs-4m
Method => Compound => CBS-Qcbs-q
Method => Compound => CBS-QB3cbs-qb3
Method => Compound => CBS-APNOcbs-apno
Method => Compound => W1BDw1bd
Method => Compound => W1Uw1u
Method => Compound => W1ROw1ro
Method => Compound => G1g1
Method => Compound => G2g2
Method => Compound => G1g1
Method => Compound => G3Sg3s
Method => Compound => G4g4
Use sparse matricessparse
Multilayer ONIOM Modeloniom
Link0 Tab
Memory Limit%mem
Shared Processors%nprocshared
Chkpoint File%chk
OldChk File%oldchk
Read-write File%rwf
Linda Workers%lindaworkers
General Tab
Use Quadratically Convergent SCFscf=qc
Ignore Symmetrynosymm
Use Modified Redundant Coordinatesgeom=modredundant
Use Counterposecounterpoise=
Write Connectivitygeom=connectivity
Write Gaussian Fragment Data fragment in molecule specification
Additional Print #p
Write PDB Data included in molecule specification
Compute Polaritiespolar
Compute Optical Rotationsoptrot
Read Incident Light Freqs => Yescphf=rdfreq
Read Incident Light Freqs => Nocphf=noread
Use MaxDisk= maxdisk
Geometry => Molecule Specificationgeom=check
Geometry => Title, ..., Molecule Specificationgeom=allcheck
Force Constants => Read Internalopt=readfc
Force Constants => Read Cartesianopt=rcfc
MO Guessguess=read
Guess Tab
Guess Method => Core Hamiltonianguess=core
Guess Method => Extended Huckelguess=huckel
Guess Method => Read checkpoint Fileguess=read
Guess Method => Read checkpoint if possible; otherwise generateguess=tcheck
Guess Method => Read input checkpoint fileguess=input
Mix HOMO and LUMO orbitalsguess=mix
Always generate guess in optimizationsguess=always
Only do guess (no SCF)guess=only
Localize Orbitalsguess=local
Save Orbitals to checkpoint fileguess=save
Permuted orbitals from MOs Dialogguess=alter
Use fragments (atom groups) for generating guessguess=fragment
Population Tab
Level of Output => Fullpop=full
Level of Output => Regularpop=regular
Level of Output => Minimalpop=minimal
Level of Output => Nonepop=none
At every geometrypop=always
Merz-Kollmanpop=mk
Hirshfeld (CM5) Chargespop=hirshfeld
Natural Transition Orbitalspop=nto
Biorthogonalize orbitalspop=biorth
Perform NBO calc => Full NBOpop=nbo
Perform NBO calc => NPA onlypop=npa
Perform NBO calc => Full NBO (use NBO 6)pop=nbo6
Perform NBO calc => NPA only (use NBO 6)pop=npa6
Save orbitals to chk file => Save NLMOspop=savenlmos
Save orbitals to chk file => Save NBOspop=savenbos
Save orbitals to chk file => Save Mixture of NLMOs and NBOspop=savemixed
Save orbitals to chk file => Save NTOspop=savento
Save orbitals to chk file => Save Biorthogonalizedpop=savebiorth
Save changes for later MM => Save Mullikenpop=savemulliken
Save changes for later MM => Save ESPpop=saveesp
Save changes for later MM => Save NPApop=savenpa
Save changes for later MM => Save Hirshfeldpop=savecm5
Select density for analysis => Currentdensity=current
Select density for analysis => SCFdensity=scf
Select density for analysis => MP2density=mp2
Select density for analysis => Transition density=transition
Select density for analysis => All Transitionsdensity=alltransition
Select density for analysis => CIdensity=ci
Select density for analysis => QCI/CCdensity=qci
Read density from checkpoint filedensity=check
PBC Tab
k-Space Integration Method => Gamma Point Only (k = 0) pbc=gammaonly
k-Space Integration Method => Specify Number of Pointspbc=nkpoints
Solvation Tab
Model => IEFPCM scrf=iefpcm
Model => SMDscrf=smd
Model => I-PCMscrf=ipcm
Model => SCI-PCMscrf=scipcm
Model => CPCMscrf=cpcm
Model => Read checkpoint filescrf=check
Solventsolvent
Read additional inputscrf=read