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 0=She))
      (NUC (V 1=described))
      (PP (P 2=to) (NP (PRO 3=him)))
      (NP
        (NP
          (OP-DEF 15=the)
          (CORE_N
            (NUC_N (N 16=stiffening))
            (PP
              (P 17=of)
              (NP
                (NPIP (NP (CORE_N (NUC_N (N-PROP 18=Katharine))) (POS 19='s)))
                (CORE_N (NUC_N (N 20=body)))))
            (PP-PERI
              (CORE_P
                (NUC_P (P 21=as) (ADV 22=soon) (P 23=as))
                (CLAUSE
                  (CORE (NP (PRO 24=he)) (NUC (V 25=touched)) (NP (PRO 26=her)))))))
          (, 27=,))
        (NP
          (OP-DEF 28=the)
          (NP-PERI
            (CORE_N
              (NUC_N
                (N 29=way)
                (CLAUSE-PERI
                  (PrCS
                    (PP-REL
                      (CORE_P (NUC_P (P 30=in)) (NP-REL (PRO-REL 31=which)))))
                  (CORE
                    (NP (PRO 32=she))
                    (ADVP-PERI (CORE_ADV (NUC_ADV (ADV 33=still))))
                    (NUC (V 34=seemed)))
                  (CORE
                    (CLM 35=to)
                    (NUC (OP-ASP 36=be) (V 37=pushing))
                    (NP (PRO 38=him))
                    (PP (CORE_P (NUC_P (P 39=from)) (NP (PRO 40=her))))
                    (PP-PERI
                      (CORE_P
                        (NUC_P (P 41=with))
                        (NP
                          (CORE_N
                            (QP-PERI (CORE_Q (NUC_Q (QNT 42=all))))
                            (NUC_N (N 44=strength)))
                          (OP-DEF 43=her))))
                    (CLAUSE-PERI
                      (, 45=,)
                      (ADVP-PERI (CORE_ADV (NUC_ADV (ADV 46=even))))
                      (CLM 47=when)
                      (CORE
                        (NP (OP-DEF 48=her) (CORE_N (NUC_N (N 49=arms))))
                        (NUC (AUX-TNS 50=were) (V 51=clasped))
                        (ADVP-PERI (CORE_ADV (NUC_ADV (ADV 52=tightly))))
                        (PP (CORE_P (NUC_P (P 53=round)) (NP (PRO 54=him))))))))))))))
    (CLAUSE-PERI
      (ADVP-PERI (, 4=,) (CORE_ADV (NUC_ADV (ADV 5=almost))))
      (CLM 6=as)
      (CLM 7=though)
      (CORE (NP (PRO 8=she)) (NUC (V 10=seen)))
      (OP-TNS 9=had)
      (CORE (CLM 11=or) (NUC (V 12=felt)) (NP (PRO 13=it)))
      (, 14=,)))
  (. 55=.))