All functions are listed here alphabetically. In the formula wizard, you also have an additional list sorted by functional group.
Abs
AddDays
AddHours
AddMinutes
AddMonths
AddSeconds
AddWeeks
AddYears
Alias$
ApplicationPath$
ArcCos
ArcSin
ArcTan
Asc
AskString$
AskStringChoice$
ATrim$
Avg
Barcode
Barcode$
BarcodeType$
BasedStr$
BinaryAND
BinaryNOT
BinaryOR
BinarySHL
BinarySHR
BinaryXOR
BMPMapToGray
BMPRotate
Capitalize$
Case$
Ceil
Century
ChangeLightness
ChangeType
CheckMod10
Chr$
ChrSubst$
CMYK
Cond
Constant.Pi
Contains
Continued
Cos
Count
CountIf
CountryFlag
Crosstab.Cells.Avg
Crosstab.Cells.Max
Crosstab.Cells.Min
Crosstab.Cells.Sum
Crosstab.Col
Crosstab.Col$
Crosstab.Row
Crosstab.Row$
Crosstab.Total
Crosstab.Value
CStr$
CurrentDataLineIndex
CurrentLineIndex
CurrentLineTypeIndex
Date
Date$
DateDiff
DateDiff$
DateHMS
DateHMSStr
DateInLeapYear
DateInRange
DateToJulian
DateYMD
Day
Day$
Decade
DisplayValues$
Distinct
Div
Dow
Dow$
Drawing
Drawing$
DrawingHeightSCM
DrawingWidthSCM
Empty
EndsWith
EOMonth
Evaluate
Even
Exists
Exp
Exp10
ExtractDate
ExtractTime
FirstHeaderThisTable
Floor
Frac
FStr$
GeometricAvg
GetIniString$
GetRegistryString$
GetValue
GetVar
GS1Text$
HeatmapColor
Hour
HSL
HTMLtoPlainText$
Hyperlink$
IBAN$
If
IssueIndex
Int
IsNull
IsNullOrEmpty
Join$
JulianToDate
LangCase$
LastFooterThisTable
LastPage
Left$
Len
LibraryPath$
LoadFile$
Locale$
LocaleInfo$
LocCurr$
LocCurrL$
LocDate$
LocDateTime
LocNumber$
LocTime$
LocVal
Log
Log10
Lower$
LTrim$
Max
Maximum
Median
Mid$
Min
Minimum
Minute
Mode
Month
Month$
NativeAvg
NativeCount
NativeMax
NativeMin
NativeStdDevPop
NativeStdDevSamp
NativeSum
NativeVarPop
NativeVarSamp
Now
NthLargest
NthLargestIndex
NthValue
Null
NullSafe
NumInRange
Odd
Ord
Page
Page$
PageBreak$
PlainTexttoHTML$
Pow
Precalc
Previous
PreviousUsed
PrintPassCount
PrintPassIndex
ProjectParameter$
ProjectPath$
Quarter
RainbowColor
RegExMatch$
RegExSubst$
RemainingTableSpace
Rep$
ReplaceChr$
ReplaceRegEx$
ReplaceStr$
ReportSectionID$
RGB
RGBStr$
Right$
Roman$
Round
RTFtoPlainText$
Rtrim$
Script$
ScriptBool
ScriptDate
ScriptVal
Second
SetVar
Sign
Sin
Sqrt
StartsWith
StdDeviation
Str$
StrPos
StrRPos
StrSubst$
Sum
TableWidth
Tan
TextWidth
Time$
Today
ToFrac$
Token$
ToNumber
ToRTF$
ToString$
Total$
TotalPages$
Translate$
UnitFromSCM
URLDecode$
URLEncode$
UTF8Encode$
Upper$
Val
Variance
WildcardMatch
Woy
Year
Year$