PDFvcon is a GUI front-end for Ghostscript that converts the version of a PDF document. If you have software that can accept only up to version 1.4 of a PDF document and the file you have is 1.6, then this is your answer. It was created out of a need for the author to be able use some of his old Windows software.
pdf2htmlEX renders PDF files in HTML. It aims to provide an accurate rendering while being optimized for Web display. It is designed for scientific papers with complicated formulas and figures, so a precise rendering is the first concern, but general PDF files are also supported.
hpdf.js is a scrip to create PDFs in your browser (it is a port of libharu). Existing projects with the same goal lack a lot of features (e.g. custom fonts). hpdf.js supports custom fonts (Type1 and TTF), PNG, JPEG, and RAW images, password protection, text and link annotations, outlines, drawing function (lines, cycles etc.), encoding support, and more.
printformPdf is a wrapper for the TCPDF class that allows you to documents from a PDF template by populating it with user data. It has features for printing "data grids" and repeating data on the page (which is useful for business cards, for example) and drawing bar codes, QR codes, polygons, and images from source picture files etc. Data priniting parameters (position, font name/size, color, rotation) can be saved in an XML configuration file.
Aspose.BarCode is a Java based visual component for generation and recognition of 1D and 2D barcodes to support Java and Web applications. It supports over 29 barcode symbologies like MSI, QR, OneCode, Australia Post, Aztec, Code128, Code11, EAN128, Codabar, Postnet, and USPS. It also supports image output in GIF, PNG, BMP, and JPEG formats. Other features include barcode size and color settings, rotation angles, and captions. You can render barcodes to images, printers, HTTP servlet responses, and graphical objects.
pdf_gantt is a TCPDF wrapper class for rendering Gantt charts as a part of a created PDF document. It has features for adjusting the printing area, font colors for different text blocks, background and referencing arrows colors, and other parameters. It will automatically adjust start dates for dependant tasks to start right after "parent" tasks. List of people responsible for each task can be printed. The class can be used standalone or as a PrintFormPDF plugin.