Your primary choices in renderers are the following:
- XPDF - the OG *nix PDF renderer.
- Poppler (fork of xpdf). Probably most featureful,
different features supported among different
implementations (e.g. Evince and Okular appear to
behave differently and have different feature sets).
- Mupdf, newer code base, made by Ghostscript team. Only
supports rendering PDFs and XPS. No fancy javascript
or form support.
- PDF.js via Mozilla browsers.
- PDFium via Chrome-based browsers.