標註大師
Annotium Team
DeftPDF - PDF Editor, Annotate
Sictec Infotech Inc.
Annotate - Image Annotation To
RHS Apps
iMarkup: 在照片上繪製和標記
Winterso Team
Flexcil筆記與PDF編輯器
Flexcil Inc.
Notewise - 手寫筆記 & PDF
Notewise
Squid: Take Notes, Markup PDFs
Steadfast Innovation, LLC
Sketch on PDF
mspnr
Xodo PDF | PDF Reader & Editor
Apryse Software Inc.