<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM ALLAIRE
CORPORATION FINANCIAL STATEMENTS AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE
TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000

                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-END>                               JUN-30-1999
<CASH>                                          19,532
<SECURITIES>                                    33,971
<RECEIVABLES>                                    5,602
<ALLOWANCES>                                     (547)
<INVENTORY>                                        224
<CURRENT-ASSETS>                                59,305
<PP&E>                                           7,938
<DEPRECIATION>                                 (3,221)
<TOTAL-ASSETS>                                  64,300
<CURRENT-LIABILITIES>                           20,642
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           236
<OTHER-SE>                                      42,601
<TOTAL-LIABILITY-AND-EQUITY>                    64,300
<SALES>                                         17,724
<TOTAL-REVENUES>                                21,772
<CGS>                                            1,103
<TOTAL-COSTS>                                    4,403
<OTHER-EXPENSES>                                23,701
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                 206
<INCOME-PRETAX>                                (5,529)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                            (5,529)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                   (5,529)
<EPS-BASIC>                                     (0.26)
<EPS-DILUTED>                                   (0.26)