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=Throughout))
          (NP
            (CORE_N
              (AP-PERI (CORE_A (NUC_A (V-PART 1=recorded))))
              (NUC_N (N 2=time)))))
        (, 3=,))
      (PP-PERI
        (CLM 4=and)
        (ADVP-PERI (CORE_ADV (NUC_ADV (ADV 5=probably))))
        (CORE_P
          (NUC_P (P 6=since))
          (NP
            (OP-DEF 7=the)
            (CORE_N
              (NUC_N (N 8=end))
              (PP
                (P 9=of)
                (NP
                  (OP-DEF 10=the)
                  (CORE_N (NUC_N (N-PROP 11=Neolithic) (N-PROP 12=Age))))))))
        (, 13=,))
      (NP (PRO-DEM 14=there))
      (NUC (V 16=been))
      (NP
        (CORE_N
          (QP-PERI (CORE_Q (NUC_Q (QNT 17=three))))
          (N 18=kinds)
          (PP (P 19=of) (NP (CORE_N (NUC_N (N 20=people)))))
          (PP-PERI
            (CORE_P
              (NUC_P (P 21=in))
              (NP (OP-DEF 22=the) (CORE_N (NUC_N (N 23=world)))))))
        (NP-PERI
          (, 24=,)
          (NP (OP-DEF 25=the) (CORE_N (NUC_N (N-PROP 26=High))) (, 27=,))
          (NP (OP-DEF 28=the) (CORE_N (NUC_N (N-PROP 29=Middle))) (, 30=,))
          (NP (CLM 31=and) (OP-DEF 32=the) (CORE_N (NUC_N (N-PROP 33=Low)))))))
    (OP-TNS 15=have))
  (. 34=.))