org.apache.poi.ss.usermodel
Interfaces 
AutoFilter
BorderFormatting
Cell
CellRange
CellStyle
Chart
ChildAnchor
ClientAnchor
Color
ColorScaleFormatting
Comment
ConditionalFormatting
ConditionalFormattingRule
ConditionalFormattingThreshold
ConditionFilterData
CreationHelper
DataBarFormatting
DataFormat
DataValidation
DataValidationConstraint
DataValidationHelper
DifferentialStyleProvider
Drawing
Font
FontFormatting
Footer
FormulaEvaluator
Header
HeaderFooter
Hyperlink
IconMultiStateFormatting
Name
ObjectData
PatternFormatting
Picture
PictureData
PrintSetup
RichTextString
Row
Shape
ShapeContainer
Sheet
SheetConditionalFormatting
SimpleShape
Table
TableStyle
TableStyleInfo
Textbox
Workbook
Classes 
BuiltinFormats
CellCopyPolicy
CellCopyPolicy.Builder
CellValue
ComparisonOperator
ConditionType
DataFormatter
DataValidation.ErrorStyle
DataValidationConstraint.OperatorType
DataValidationConstraint.ValidationType
DateUtil
ExcelGeneralNumberFormat
ExcelNumberFormat
ExcelStyleDateFormatter
ExtendedColor
FractionFormat
ShapeTypes
Enums 
BorderExtent
BorderStyle
CellType
ClientAnchor.AnchorType
ConditionalFormattingThreshold.RangeType
ConditionFilterType
DataConsolidateFunction
FillPatternType
FontCharset
FontFamily
FontScheme
FontUnderline
FormulaError
HorizontalAlignment
IconMultiStateFormatting.IconSet
IgnoredErrorType
IndexedColors
PageOrder
PaperSize
PrintCellComments
PrintOrientation
Row.MissingCellPolicy
SheetVisibility
TableStyleType
VerticalAlignment