Pocket, Raindrop.io, CherryTree, Milanote, Instapaper, Diigo, Trilium Notes, Pinboard, Cryptee, BibSonomy, historious, LinkAce, Zootool, Tizmos, BlogMarks, Keep Everything, Mixtags, Livearks, Eluma, AnnotateIt, Minilogs, Pistashio are some alternatives to Wheatt.