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=They))
      (NUC
        (AUX-TNS 1=were)
        (NP
          (CORE_N (AP-PERI (CORE_A (NUC_A (A 2=small)))) (NUC_N (N 3=ashes)))
          (SENTENCE-PERI
            (, 4=,)
            (CLAUSE
              (PrCS (NP-REL (PRO-REL 5=which)))
              (CLAUSE
                (CORE
                  (PP-PERI
                    (CORE_P
                      (NUC_P (P 6=at))
                      (NP (OP-DEF 7=some) (CORE_N (NUC_N (N 8=time))))))
                  (NUC (AUX-ASP 10=been) (V 11=cut) (ADV 12=down)))
                (OP-TNS 9=had))
              (CLAUSE
                (CLM 13=and)
                (OP-TNS 14=had)
                (CORE
                  (NUC (V 15=sprouted) (PRT 16=up))
                  (ADVP-PERI (CORE_ADV (NUC_ADV (ADV 17=again))))
                  (PP-PERI
                    (CORE_P
                      (NUC_P (P 18=into))
                      (NP
                        (OP-DEF 19=a)
                        (CORE_N
                          (NUC_N (N 20=forest))
                          (PP
                            (P 21=of)
                            (NP
                              (CORE_N (NUC_N (N 22=poles)))
                              (CLAUSE-PERI
                                (, 23=,)
                                (CORE
                                  (NP
                                    (PRO 24=none)
                                    (PP (P 25=of) (NP (PRO 26=them))))
                                  (NUC (A 27=thicker))
                                  (PP-PERI
                                    (CORE_P
                                      (NUC_P (P 28=than))
                                      (NP
                                        (NPIP (NP (PRO 29=one) (POS 30='s)))
                                        (CORE_N (NUC_N (N 31=wrist))))))))))))))))))))))
  (. 32=.))