RRGparbank

To change a label, click on a node to select a different label from a list. The syntactic category and the function tag (before and after the dash "-") must be selected separately by clicking on the corresponding part of the label.
To add a function tag to a node that does not have one yet, drag it from the list of function tags onto the node.
Re-attach a node by dragging and dropping it on a new parent. This can be used to created discontinuous constituents.
Similarly, nodes can be removed and new ones added by dragging to/from below the tree.
Finally, the bracketing can be edited manually in the text box below the tree; press "validate" to update the tree. Whitespace is ignored. Each token must have a dedicated POS tag.

				[...wait for it...]

(SENTENCE
  (SENTENCE
    (`` 0=``)
    (CLAUSE
      (OP-TNS 1=Did)
      (CORE
        (NP (PRO 2=I))
        (ADVP-PERI (CORE_ADV (NUC_ADV (ADV 3=ever))))
        (NUC (V 4=tell))
        (NP (PRO 5=you))
        (PP
          (P 23=about)
          (NP
            (OP-DEF 24=the)
            (CORE_N
              (NUC_N
                (N 25=time)
                (CLAUSE-PERI
                  (PrCS (ADVP-REL (ADV-REL 26=when)))
                  (CORE
                    (NP
                      (OP-DEF 27=those)
                      (CORE_N
                        (QP-PERI (CORE_Q (NUC_Q (QNT 28=two))))
                        (NUC_N (N 29=nippers))
                        (PP-PERI
                          (CORE_P (NUC_P (P 30=of)) (NP (PRO 31=mine))))))
                    (NUC (V 32=set) (N 33=fire))
                    (PP
                      (P 34=to)
                      (NP
                        (NPIP
                          (NP
                            (OP-DEF 35=the)
                            (CORE_N
                              (AP-PERI (CORE_A (NUC_A (A 36=old))))
                              (NUC_N (N 37=market-woman)))
                            (POS 38='s)))
                        (CORE_N (NUC_N (N 39=skirt))))))
                  (CLAUSE-PERI
                    (CLM 40=because)
                    (CORE (NP (PRO 41=they)) (NUC (V 42=saw)) (NP (PRO 43=her)))
                    (CORE
                      (NUC (V 44=wrapping) (PRT 45=up))
                      (NP (CORE_N (NUC_N (N 46=sausages))))
                      (PP-PERI
                        (CORE_P
                          (NUC_P (P 47=in))
                          (NP
                            (OP-DEF 48=a)
                            (CORE_N
                              (NUC_N (N 49=poster))
                              (PP
                                (P 50=of)
                                (NP (CORE_N (NUC_N (N-PROP 51=B.B.))))))))))))))))))
    (VOC
      (NP
        (, 6=,)
        (CORE_N (AP-PERI (CORE_A (NUC_A (A 7=old)))) (NUC_N (N 8=boy))))
      (, 9=,))
    ('' 10='')
    (. 22=``)
    (. 52=?)
    ('' 53=''))
  (CLAUSE
    (CORE (NP (PRO 11=he)) (NUC (V 12=said)))
    (CLAUSE-PERI
      (, 13=,)
      (CORE
        (NUC (V 14=chuckling))
        (PP-PERI
          (CORE_P
            (NUC_P (P 15=round))
            (NP
              (OP-DEF 16=the)
              (CORE_N
                (NUC_N (N 17=stem))
                (PP (P 18=of) (NP (OP-DEF 19=his) (CORE_N (NUC_N (N 20=pipe))))))))))
      (, 21=,))))