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
    (CLAUSE
      (CORE
        (NP (PRO 0=She))
        (ADVP-PERI (CORE_ADV (NUC_ADV (ADV 1=suddenly))))
        (NUC (V 2=twisted))
        (NP (PRO 3=herself))
        (ADVP-PERI (CORE_ADV (NUC_ADV (ADV 4=over))))
        (PP-PERI
          (CORE_P
            (NUC_P (P 5=in))
            (NP (OP-DEF 6=the) (CORE_N (NUC_N (N 7=bed)))))))
      (, 8=,))
    (CLAUSE
      (CORE
        (NUC (V 9=seized))
        (NP (OP-DEF 10=a) (CORE_N (NUC_N (N 11=shoe))))
        (PP-PERI
          (CORE_P
            (NUC_P (P 12=from))
            (NP (OP-DEF 13=the) (CORE_N (NUC_N (N 14=floor)))))))
      (, 15=,))
    (CLAUSE
      (CLM 16=and)
      (CORE
        (NUC (NUC (V 17=sent)) (NUC (V 19=hurtling)))
        (NP (PRO 18=it))
        (PP
          (CORE_P
            (NUC_P (P 20=into))
            (NP (OP-DEF 21=the) (CORE_N (NUC_N (N 22=corner))))))
        (PP-PERI
          (CORE_P
            (NUC_P (P 23=with))
            (NP
              (OP-DEF 24=a)
              (CORE_N
                (AP-PERI (CORE_A (NUC_A (A 25=boyish))))
                (NUC_N (N 26=jerk))
                (PP (P 27=of) (NP (OP-DEF 28=her) (CORE_N (NUC_N (N 29=arm)))))))))
        (PP-PERI
          (, 30=,)
          (ADVP-PERI (CORE_ADV (NUC_ADV (ADV 31=exactly))))
          (CORE_P
            (NUC_P (P 32=as))
            (CLAUSE
              (CORE (NP (PRO 33=he)) (NUC (V 35=seen)) (NP (PRO 36=her)))
              (OP-TNS 34=had)
              (CORE
                (NUC (V 37=fling))
                (NP (OP-DEF 38=the) (CORE_N (NUC_N (N 39=dictionary))))
                (PP-PERI
                  (CORE_P
                    (NUC_P (P 40=at))
                    (NP (CORE_N (NUC_N (N-PROP 41=Goldstein))))))
                (NP-PERI
                  (, 42=,)
                  (OP-DEF 43=that)
                  (CORE_N
                    (NUC_N (N 44=morning))
                    (PP-PERI
                      (CORE_P
                        (NUC_P (P 45=during))
                        (NP
                          (OP-DEF 46=the)
                          (CORE_N
                            (NUC_N
                              (N-PROP 47=Two)
                              (N-PROP 48=Minutes)
                              (N-PROP 49=Hate)))))))))))))))
  (. 50=.))