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
        (OP-DEF 0=His)
        (CORE_N (QP-PERI (CORE_Q (NUC_Q (QNT 1=first)))) (NUC_N (N 2=feeling))))
      (NUC (AUX-TNS 3=was) (NP (CORE_N (NUC_N (N 4=relief)))))
      (, 5=,)))
  (CLAUSE
    (CLM 6=but)
    (CORE
      (CLAUSE-PERI
        (CLM 7=as)
        (CORE (NP (PRO 8=he)) (NUC (V 9=watched)))
        (CORE
          (NP
            (OP-DEF 10=the)
            (CORE_N
              (AP-PERI (CORE_A (NUC_A (A 11=strong))))
              (AP-PERI (CORE_A (NUC_A (A 12=slender))))
              (NUC_N (N 13=body))))
          (NUC (V 14=moving))
          (PP (CORE_P (NUC_P (P 15=in) (N 16=front) (P 17=of)) (NP (PRO 18=him))))
          (PP-PERI
            (, 19=,)
            (CORE_P
              (NUC_P (P 20=with))
              (NP
                (OP-DEF 21=the)
                (CORE_N
                  (AP-PERI (CORE_A (NUC_A (A 22=scarlet))))
                  (NUC_N
                    (N 23=sash)
                    (CLAUSE-PERI
                      (PrCS (NP-REL (PRO-REL 24=that)))
                      (CORE
                        (CORE
                          (NUC
                            (AUX-TNS 25=was)
                            (ADVP-PERI
                              (CORE_ADV
                                (ADVP-PERI
                                  (CORE_ADV (NUC_ADV (ADV 26=just))))
                                (NUC_ADV (ADV 28=enough))))
                            (A 27=tight)))
                        (CORE
                          (CLM 29=to)
                          (NUC (V 30=bring) (PRT 31=out))
                          (NP
                            (OP-DEF 32=the)
                            (CORE_N
                              (NUC_N (N 33=curve))
                              (PP
                                (P 34=of)
                                (NP
                                  (OP-DEF 35=her)
                                  (CORE_N (NUC_N (N 36=hips))))))))))))))
            (, 37=,))))
      (NP
        (OP-DEF 38=the)
        (CORE_N
          (NUC_N (N 39=sense))
          (PP
            (P 40=of)
            (NP
              (OP-DEF 41=his)
              (CORE_N
                (AP-PERI (CORE_A (NUC_A (A 42=own))))
                (NUC_N (N 43=inferiority)))))))
      (NUC (AUX-TNS 44=was) (A 45=heavy))
      (PP-PERI (CORE_P (NUC_P (P 46=upon)) (NP (PRO 47=him))))))
  (. 48=.))