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
          (OP-DEF 0=The)
          (CORE_N
            (NUC_N (V-GER 1=reporting))
            (PP
              (P 2=of)
              (NP
                (NPIP
                  (NP (CORE_N (NUC_N (N-PROP 3=Big) (N-PROP 4=Brother))) (POS 5='s)))
                (CORE_N
                  (NUC_N (N-PROP 6=Order) (P 7=for) (OP-DEF 8=the) (N-PROP 9=Day)))))
            (PP-PERI
              (CORE_P
                (NUC_P (P 10=in))
                (NP
                  (OP-DEF 11=the)
                  (CORE_N
                    (NUC_N (N-PROP 12=Times))
                    (PP
                      (P 13=of)
                      (NP
                        (CORE_N
                          (NUC_N (N 14=December))
                          (QP (CORE_Q (NUC_Q (QNT 15=3rd))))
                          (NP-PERI (CORE_N (NUC_Q (QNT 16=1983)))))))))))))
        (NUC
          (AUX-TNS 17=is)
          (ADVP-PERI (CORE_ADV (NUC_ADV (ADV 18=extremely))))
          (A 19=unsatisfactory))))
    (CLAUSE
      (CLM 20=and)
      (CORE
        (NUC (V 21=makes) (N 22=references))
        (PP
          (P 23=to)
          (NP
            (CORE_N (AP-PERI (CORE_A (NUC_A (A 24=non-existent)))) (NUC_N (N 25=persons))))))))
  (. 26=.))