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
  (CLAUSE
    (CORE
      (NP (PRO-DEM 0=There))
      (NUC (V 1=was))
      (NP
        (OP-DEF 2=the)
        (CORE_N
          (AP-PERI (CORE_A (NUC_A (A 3=usual))))
          (AP-PERI (CORE_A (NUC_A (A 4=boiled-cabbage))))
          (NUC_N (N 5=smell)))
        (CLAUSE-PERI
          (, 6=,)
          (CORE
            (NUC (A 7=common))
            (PP
              (P 8=to)
              (NP
                (OP-DEF 9=the)
                (CORE_N
                  (AP-PERI (CORE_A (NUC_A (A 10=whole))))
                  (NUC_N (N 11=building))))))
          (, 12=,)))))
  (CLAUSE
    (CLM 13=but)
    (CORE
      (NP (PRO 14=it))
      (NUC (AUX-TNS 15=was) (V 16=shot) (PRT 17=through))
      (PP
        (P 18=by)
        (NP
          (OP-DEF 19=a)
          (CORE_N
            (AP-PERI (CORE_A (NUC_A (A 20=sharper))))
            (NUC_N (N 21=reek))
            (PP (P 22=of) (NP (CORE_N (NUC_N (N 23=sweat))))))
          (SENTENCE-PERI
            (, 24=,)
            (CLAUSE
              (PrCS (NP-REL (PRO-REL 25=which)))
              (CORE
                (NUC
                  (AUX-TNS 42=was)
                  (NP
                    (OP-DEF 43=the)
                    (CORE_N
                      (NUC_N (N 44=sweat))
                      (PP-PERI
                        (CORE_P
                          (NUC_P (P 45=of))
                          (NP
                            (OP-DEF 46=some)
                            (CORE_N
                              (NUC_N
                                (N 47=person)
                                (CORE-PERI
                                  (OP-NEG 48=not)
                                  (NUC (A 49=present))
                                  (PP-PERI
                                    (CORE_P
                                      (NUC_P (P 50=at))
                                      (NP
                                        (OP-DEF 51=the)
                                        (CORE_N (NUC_N (N 52=moment)))))))))))))))))
            (CLAUSE-PERI
              (. 26=-)
              (CORE
                (NP (PRO 27=one))
                (NUC (V 28=knew))
                (NP (PRO-DEM 29=this))
                (PP-PERI
                  (CORE_P
                    (NUC_P (P 30=at))
                    (NP
                      (OP-DEF 31=the)
                      (CORE_N
                        (QP-PERI (CORE_Q (NUC_Q (QNT 32=first))))
                        (NUC_N (N 33=sniff)))))))
              (CLAUSE-PERI
                (, 34=,)
                (CLM 35=though)
                (CORE
                  (CORE (NP (PRO 36=it)) (NUC (AUX-TNS 37=was) (A 38=hard)))
                  (CORE (NUC (CLM 39=to) (V 40=say)) (ADVP-WH (ADV-WH 41=how)))))))))))
  (. 53=.))