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
  (SENTENCE
    (CLAUSE
      (CORE
        (PP-PERI
          (CORE_P
            (NUC_P (P 0=By))
            (CORE
              (NUC (V 1=leaving))
              (NP (OP-DEF 2=the) (CORE_N (NUC_N (N 3=Ministry))))
              (PP-PERI
                (CORE_P
                  (NUC_P (P 4=at))
                  (NP
                    (OP-DEF 5=this)
                    (CORE_N
                      (NUC_N (N 6=time))
                      (PP
                        (CORE_P
                          (NUC_P (P 7=of))
                          (NP (CORE_N (NUC_N (N 8=day)))))))))))))
        (NP (PRO 9=he))
        (NUC (V 11=sacrificed))
        (NP
          (OP-DEF 12=his)
          (CORE_N
            (NUC_N (N 13=lunch))
            (PP-PERI
              (CORE_P
                (NUC_P (P 14=in))
                (NP (OP-DEF 15=the) (CORE_N (NUC_N (N 16=canteen)))))))))
      (OP-TNS 10=had)
      (, 17=,)))
  (SENTENCE
    (CLM 18=and)
    (CLAUSE
      (CORE (NP (PRO 19=he)) (NUC (AUX-TNS 20=was) (A 21=aware)))
      (CLAUSE
        (CLM 22=that)
        (CORE
          (NP (PRO-DEM 23=there))
          (NUC (V 24=was))
          (NP (OP-DEF 25=no) (CORE_N (NUC_N (N 26=food))))
          (PP-PERI
            (CORE_P
              (NUC_P (P 27=in))
              (NP (OP-DEF 28=the) (CORE_N (NUC_N (N 29=kitchen))))))
          (PP-PERI
            (CORE_P
              (NUC_P (P 30=except))
              (NP
                (OP-DEF 31=a)
                (CORE_N
                  (NUC_N (N 32=hunk))
                  (PP
                    (P 33=of)
                    (NP
                      (CORE_N
                        (AP-PERI (CORE_A (NUC_A (A 34=dark-coloured))))
                        (NUC_N
                          (N 35=bread)
                          (CLAUSE-PERI
                            (PrCS (NP-REL (PRO-REL 36=which)))
                            (OP-TNS 37=had)
                            (CORE
                              (CORE (NUC (V 38=got)))
                              (CORE
                                (CLM 39=to)
                                (NUC (AUX 40=be) (V 41=saved))
                                (PP
                                  (CORE_P
                                    (NUC_P (P 42=for))
                                    (NP
                                      (NPIP
                                        (NP
                                          (CORE_N (NUC_ADV (ADV 43=tomorrow)))
                                          (POS 44='s)))
                                      (CORE_N (NUC_N (N 45=breakfast)))))))))))))))))))))
  (. 46=.))