org.apache.poi.ss.usermodel
Interfaces 
AutoFilter
BorderFormatting
Cell
CellRange
CellStyle
Chart
ClientAnchor
Color
Comment
ConditionalFormatting
ConditionalFormattingRule
CreationHelper
DataFormat
DataValidation
DataValidationConstraint
DataValidationHelper
Drawing
Font
FontFormatting
Footer
FormulaEvaluator
Header
HeaderFooter
Hyperlink
Name
PatternFormatting
Picture
PictureData
PrintSetup
RichTextString
Row
Sheet
SheetConditionalFormatting
Textbox
Workbook
Classes 
BuiltinFormats
CellValue
ComparisonOperator
DataFormatter
DataValidation.ErrorStyle
DataValidationConstraint.OperatorType
DataValidationConstraint.ValidationType
DateUtil
ErrorConstants
ExcelStyleDateFormatter
Row.MissingCellPolicy
ShapeTypes
WorkbookFactory
Enums 
BorderStyle
FillPatternType
FontCharset
FontFamily
FontScheme
FontUnderline
FormulaError
HorizontalAlignment
IndexedColors
PageOrder
PaperSize
PrintCellComments
PrintOrientation
VerticalAlignment