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=They))
        (NUC (V 1=threaded))
        (NP (OP-DEF 2=their) (CORE_N (NUC_N (N 3=way))))
        (PP-PERI
          (CORE_P
            (NUC_P (P 4=across))
            (NP
              (OP-DEF 5=the)
              (CORE_N (AP-PERI (CORE_A (NUC_A (A 6=crowded)))) (NUC_N (N 7=room))))))))
    (CLAUSE
      (CLM 8=and)
      (CORE
        (NUC (V 9=unpacked))
        (NP (OP-DEF 10=their) (CORE_N (NUC_N (N 11=trays))))
        (PP
          (CORE_P
            (NUC_P (P 12=on) (P 13=to))
            (NP
              (OP-DEF 14=the)
              (CORE_N
                (AP-PERI (CORE_A (NUC_A (A 15=metal-topped))))
                (NUC_N (N 16=table)))
              (SENTENCE-PERI
                (, 17=,)
                (CLAUSE
                  (PrCS
                    (PP-REL
                      (CORE_P
                        (NUC_P (P 18=on))
                        (NP
                          (CORE_N
                            (QP-PERI (CORE_Q (NUC_Q (QNT 19=one))))
                            (NUC_N (N 20=corner))
                            (PP-REL
                              (CORE_P
                                (NUC_P (P 21=of))
                                (NP-REL (PRO-REL 22=which)))))))))
                  (CORE
                    (NP (PRO 23=someone))
                    (NUC (V 25=left))
                    (NP
                      (OP-DEF 26=a)
                      (CORE_N
                        (NUC_N (N 27=pool))
                        (PP (P 28=of) (NP (CORE_N (NUC_N (N 29=stew))))))
                      (NP-PERI
                        (, 30=,)
                        (OP-DEF 31=a)
                        (CORE_N
                          (AP-PERI (CORE_A (NUC_A (A 32=filthy))))
                          (AP-PERI (CORE_A (NUC_A (A 33=liquid))))
                          (NUC_N
                            (N 34=mess)
                            (CLAUSE-PERI
                              (PrCS (NP-REL (PRO-REL 35=that)))
                              (CORE
                                (NUC (V 36=had))
                                (NP
                                  (OP-DEF 37=the)
                                  (CORE_N
                                    (NUC_N (N 38=appearance))
                                    (PP
                                      (P 39=of)
                                      (NP (CORE_N (NUC_N (N 40=vomit))))))))))))))
                  (OP-TNS 24=had)))))))))
  (. 41=.))