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
      (PP-PERI
        (CORE_P (NUC_P (P 0=Like)) (NP (OP-DEF 1=an) (CORE_N (NUC_N (N 2=answer)))))
        (, 3=,))
      (NP
        (OP-DEF 4=the)
        (CORE_N
          (QP-PERI (CORE_Q (NUC_Q (QNT 5=three))))
          (NUC_N (N 6=slogans))
          (PP-PERI
            (CORE_P
              (NUC_P (P 7=on))
              (NP
                (OP-DEF 8=the)
                (CORE_N
                  (AP-PERI (CORE_A (NUC_A (A 9=white))))
                  (NUC_N (N 10=face))
                  (PP
                    (P 11=of)
                    (NP
                      (OP-DEF 12=the)
                      (CORE_N (NUC_N (N-PROP 13=Ministry) (P 14=of) (N-PROP 15=Truth)))))))))))
      (NUC (V 16=came))
      (ADVP-PERI (CORE_ADV (NUC_ADV (ADV 17=back))))
      (PP (CORE_P (NUC_P (P 18=to)) (NP (PRO 19=him)))))
    (. 20=:)
    (TEXT
      (SENTENCE
        (`` 21=``)
        (CLAUSE
          (CORE
            (NP (CORE_N (NUC_N (N 22=War))))
            (NUC (AUX-TNS 23=is) (NP (CORE_N (NUC_N (N 24=peace)))))))
        (. 25=''))
      (SENTENCE
        (`` 26=``)
        (CLAUSE
          (CORE
            (NP (CORE_N (NUC_N (N 27=Freedom))))
            (NUC (AUX-TNS 28=is) (NP (CORE_N (NUC_N (N 29=slavery)))))))
        (. 30=''))
      (SENTENCE
        (`` 31=``)
        (CLAUSE
          (CORE
            (NP (CORE_N (NUC_N (N 32=Ignorance))))
            (NUC (AUX-TNS 33=is) (NP (CORE_N (NUC_N (N 34=strength)))))))
        ('' 35=''))))
  (CLAUSE
    (CORE
      (NP (PRO 36=He))
      (NUC (V 37=took))
      (NP
        (OP-DEF 38=a)
        (CORE_N
          (NP-PERI
            (CORE_N (QP (CORE_Q (NUC_Q (QNT 39=twenty-five)))) (NUC_N (N 40=cent))))
          (NUC_N (N 41=piece))))
      (PP
        (CORE_P
          (NUC_P (P 42=out) (P 43=of))
          (NP (OP-DEF 44=his) (CORE_N (NUC_N (N 45=pocket))))))))
  (. 46=.))