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=He)) (NUC (V 1=knew)))
    (CLAUSE
      (CLM 2=that)
      (CORE
        (PP-PERI
          (CORE_P
            (NUC_P (P 3=in))
            (NP
              (OP-DEF 4=the)
              (CORE_N
                (NUC_N
                  (N 5=cubicle)
                  (CORE-PERI (NUC (V 6=next)) (PP (P 7=to) (NP (PRO 8=him)))))))))
        (NP
          (OP-DEF 9=the)
          (CORE_N
            (AP-PERI (CORE_A (NUC_A (A 10=little))))
            (NUC_N (N 11=woman))
            (PP-PERI
              (CORE_P
                (NUC_P (P 12=with))
                (NP
                  (CORE_N
                    (AP-PERI (CORE_A (NUC_A (A 13=sandy))))
                    (NUC_N (N 14=hair))))))))
        (NUC (V 15=toiled))
        (ADVP-PERI
          (CORE_ADV
            (NUC_ADV
              (NUC_ADV (N 16=day) (ADV 17=in))
              (NUC_ADV (N 18=day) (ADV 19=out)))))
        (PP
          (, 20=,)
          (ADVP-PERI (CORE_ADV (NUC_ADV (ADV 21=simply))))
          (P 22=at)
          (CORE
            (CORE (NUC (V 23=tracking) (PRT 24=down)))
            (CORE
              (CLM 25=and)
              (NUC (V 26=deleting))
              (PP-PERI
                (CORE_P
                  (NUC_P (P 27=from))
                  (NP (OP-DEF 28=the) (CORE_N (NUC_N (N-PROP 29=Press))))))
              (NP
                (OP-DEF 30=the)
                (CORE_N
                  (NUC_N (N 31=names))
                  (PP
                    (P 32=of)
                    (NP
                      (CORE_N
                        (NUC_N
                          (N 33=people)
                          (CLAUSE-PERI
                            (CLAUSE
                              (PrCS (NP-REL (PRO-REL 34=who)))
                              (OP-TNS 35=had)
                              (CORE (NUC (AUX-ASP 36=been) (V 37=vaporized))))
                            (CLAUSE
                              (CLM 38=and)
                              (CORE
                                (CORE (NUC (AUX-TNS 39=were) (V-PART 41=considered)))
                                (CORE
                                  (ADVP-PERI
                                    (CORE_ADV (NUC_ADV (ADV 42=never))))
                                  (CLM 43=to)
                                  (NUC (OP-ASP 44=have) (V 45=existed))))
                              (ADVP-PERI
                                (CORE_ADV (NUC_ADV (ADV 40=therefore))))))))))))))))))
  (. 46=.))