Ghostscript is a rendering and conversion engine for page description languages, including Postscript and PDF. It has ability to convert PostScript language files to many raster formats, view them on displays, and print them on printers that don't have PostScript language capability built in. 

Ghostscript - Document Rendering and Conversion

Signal is a messaging app for simple private communication with friends. Signal uses your phone's data connection (WiFi/3G/4G) to communicate securely, optionally supports plain SMS/MMS to function as a unified messenger, and can also encrypt the stored messages on your phone.

Signal-Android - A private messenger for Android, alternative to WhatsApp

Proxmox Virtual Environment is a powerful Open Source Server Virtualization Platform, based on KVM and OpenVZ. It gives you near-bare-metal performance and leading scalability for your  workloads. You can virtualize even the most demanding application workloads. It supports 32 bit and 64 bit Windows and Linux servers.

Proxmox - Virtualization Platform

Zotero [zoh-TAIR-oh] is a free, easy-to-use tool to help you collect, organize, cite, and share your research sources. It lives right where you do your work—in the web browser itself. It is a research tool that automatically senses content, allowing you to add it to your personal library with a single click.
 
Zotero collects all your research in a single, searchable interface. You can add PDFs, images, audio and video files, snapshots of web pages, and really anything else. Zotero automatically indexes the full-text content of your library, enabling you to find exactly what you're looking for with just a few keystrokes.

Zotero [zoh-TAIR-oh] is a free, easy-to-use tool to help you collect, organize, cite, and share your research sources. It lives right where you do your work—in the web browser itself. It is a research tool that automatically senses content, allowing you to add it to your personal library with a single click.

Zotero - Tool to Collect, Organize, Cite, and Share your Research Sources

Aerospike is a distributed, scalable NoSQL database. It provides support to create a high-performance, scalable platform that would meet the needs of today's web-scale applications. It supports operational efficiency, robustness and reliability expected from traditional databases.
 
It eliminates complex, costly caching layers commonly used in NoSQL and in-memory solutions. It 
delivers elastic, predictable performance at internet scale via patented Hybrid Memory Architecture.

Aerospike is a distributed, scalable NoSQL database. It provides support to create a high-performance, scalable platform that would meet the needs of today's web-scale applications. It supports operational efficiency, robustness and reliability expected from traditional databases.

Aerospike Database Server – Flash-optimized, in-memory, nosql database

MuPDF is a lightweight PDF, XPS, and E-book viewer. It renders text with metrics and spacing accurate to within fractions of a pixel for the highest fidelity in reproducing the look of a printed page on screen. It supports PDF 1.7 with transparency, encryption, hyperlinks, annotations, searching and more. The viewer is small, fast, yet complete. It supports many document formats, such as PDF, XPS, OpenXPS, CBZ, EPUB, and FictionBook 2. You can annotate PDF documents and fill out forms with the mobile viewers (this feature is coming soon to the desktop viewer as well).

MuPDF - A Lightweight PDF, XPS and E-book viewer

DSPAM is a scalable and open-source content-based spam filter designed for multi-user enterprise systems. DSPAM is an adaptive filter which means it is capable of learning and adapting to each user's email. Instead of working off of a list of rules to identify spam. DSPAM's probabilistic engine examines the content of each message and learns what type of content the user deems as spam or nonspam. 
 Source forge: <A HREF="http://sourceforge.net/projects/dspam/" target="_blank">http://sourceforge.net/projects/dspam/</A>

DSPAM is a scalable and open-source content-based spam filter designed for multi-user enterprise systems. DSPAM is an adaptive filter which means it is capable of learning and adapting to each user's email. Instead of working off of a list of rules to identify spam. DSPAM's probabilistic engine examines the content of each message and learns what type of content the user deems as spam or nonspam.

DSpam - Content based Spam Filter

Hermes Secure Email Gateway is a Free Open Source Email Gateway that provides Spam, Virus and Malware protection, full in-transit and at-rest email encryption as well as email archiving. 
 
Hermes Secure Email Gateway combines Open Source technologies such as Postfix, Apache SpamAssassin, ClamAV, Amavisd-new and CipherMail under one unified web based Web GUI for easy administration and management of your incoming and ougoing email for your organization.
 
It can be deployed to protect your in-house email solution as well as cloud email solutions such as Google Mail and Microsoft Office 365.

Hermes Secure Email Gateway is a Free Open Source Email Gateway that provides Spam, Virus and Malware protection, full in-transit and at-rest email encryption as well as email archiving. 

Hermes Secure Email Gateway

YottaDB's diverse feature set as a NoSQL multi-level, key-value data store provides users and businesses with a strong foundation for their critical applications. It operates using a daemon-less engine. Unlike most high-end transactional database engines, YottaDB uses Optimistic Concurrency Control (OCC) to implement ACID transactions. Since transactions do not typically collide, optimistic techniques scale up better than pessimistic techniques such as locking.

YottaDB - Rock solid, Lightning Fast. Secure database

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