The bottom line: Ad-Aware is your best option for keeping spyware and adware under control on your PC
AVG AntiVirus FREE 2013 provides advanced protection for web surfing, emailing, and social networking. And it's packed with features, too: AVG Do Not Track, LinkScanner, Anti-Spyware, and free 24/7 phone support for the USA, UK, Ireland, and Canada.
Flash Player is a cross-platform browser plug-in that delivers breakthrough Web experiences to over 98% of Internet users
pdfMachine - Signer is the easy way to digitally sign your PDF files. Simply, quickly and lowpriced , Sending 1 to 1 signed copies of a document. It's never been so easy to send save documents per e-mail.
DigiSigner is a tiny PDF viewer tool to digitally sign PDF documents and verify signatures. Use mouse to position your signature and design its appearance in several clicks. Allow and disallow changes in PDFs. There are versions for Mac and Linux.
Crypto4 PKI is a set of tools designed for PKI (Public Key Infrastructure) management. Crypto4 PKI lets you create, manage and convert X.509 certificates, certificate (signing) requests and certificate revocation lists.
Adds authenticode digital signatures to executables via gui or command line without needing the Microsoft tools. Eliminates the need to manually specify the password each time. Very simple to use without any long learning curve.
Easy signature is a free digital signature software that allows digitally signing any type of file. It is an initiative to make the world greener and make everyday document management easier. It is an excellent tool for intra signature management.
602XML Form Filler
Fill XSL-FO based XML forms offline, save forms for later completion, and add an X.509 digital signature for authorization. Includes FREE business forms. Supports simple, one-click form export to Adobe PDF.
E-Lock ProSigner allows users to apply legally enforceable visible electronic signatures in MS Word, Excel TIFF and Adobe PDF files. Supports encryption-decryption as well as 3rd party time stamping.
E-Lock ProSigner Lite
E-Lock ProSigner Lite allows users to apply legally enforceable electronic signatures in MS Word, Excel and Adobe PDF files allowing the users to sign these files. It can also sign all other file formats in E-Lock Proprietary format
SignetSure is Win32 security tool for protecting files from hacker alteration. Create digital signatures for your files from Win32 app. Then authenticate your files with single API call. Uses RSA public key cryptography. C/C++ or Visual Basic.