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QuickTone : an add-in for Microsoft® Word for easy input of Pinyin text with tone marks—just lift your finger when the right tone mark appears!
Chinese syllable chart : alphabetically sortable by each system (Pinyin, GR, Wade-Giles, Yale, IPA and Zhùyīn Fúhào). Also gives GR tonal variants. [Internet Explorer users may optionally view this table in a simpler format.]
Online conversion of GR text to Pinyin (with either tone marks or syllable-final numbers—or annotate GR text with Pinyin popup "tooltips")
GR to Pinyin conversion macros (MS-Word)