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.
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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
  (PrDP
    (ADVP
      (CORE_ADV
        (NUC_ADV (ADV 0=As))
        (CLAUSE
          (CORE
            (NP (PRO 1=we))
            (ADVP-PERI (CORE_ADV (NUC_ADV (ADV 3=already))))
            (NUC (V 4=seen))
            (PP
              (CORE_P
                (NUC_P (P 5=in))
                (NP
                  (OP-DEF 6=the)
                  (CORE_N
                    (NUC_N (N 7=case))
                    (PP
                      (P 8=of)
                      (NP
                        (OP-DEF 9=the)
                        (CORE_N
                          (NUC_N (N 10=word))
                          (NP (CORE_N (NUC_N (N 11=free))))))))))))
          (OP-TNS 2=have))))
    (, 12=,))
  (CLAUSE
    (CORE
      (NP
        (CORE_N
          (NUC_N
            (N 13=words)
            (CLAUSE-PERI
              (PrCS (NP-REL (PRO-REL 14=which)))
              (OP-TNS 15=had)
              (CORE
                (ADVP-PERI (CORE_ADV (NUC_ADV (ADV 16=once))))
                (NUC (V 17=borne))
                (NP
                  (OP-DEF 18=a)
                  (CORE_N
                    (AP-PERI (CORE_A (NUC_A (A 19=heretical))))
                    (NUC_N (N 20=meaning)))))))))
      (NUC (AUX-TNS 21=were) (V 23=retained))
      (ADVP-PERI (CORE_ADV (NUC_ADV (ADV 22=sometimes))))
      (PP-PERI
        (CORE_P
          (NUC_P (P 24=for))
          (NP
            (OP-DEF 25=the)
            (CORE_N
              (NUC_N (N 26=sake))
              (PP (P 27=of) (NP (CORE_N (NUC_N (N 28=convenience)))))))))
      (PP-PERI
        (, 29=,)
        (CLM 30=but)
        (CORE_P
          (ADVP-PERI (CORE_ADV (NUC_ADV (ADV 31=only))))
          (NUC_P (P 32=with))
          (CORE
            (NP
              (OP-DEF 33=the)
              (CORE_N
                (AP-PERI (CORE_A (NUC_A (A 34=undesirable))))
                (NUC_N (N 35=meanings))))
            (NUC (V 36=purged))
            (PP (CORE_P (NUC_P (P 37=out) (P 38=of)) (NP (PRO 39=them)))))))))
  (. 40=.))