"Dual-Watch" 20m SSB Transceiver by YO3DAC/VA3IUL
ICOM introduced for the first time "Dual-Watch" architecture in IC-781 model. This is a very practical compromise which offers limited dual-receive capability. It eliminates the complexity and costs associated with a second IF chain and demodulator.
http://www.qsl.net/va3iul/Dual-Watch_TRX/Dual-Watch_TRX.htm

14MHz SSB 10mW Transceiver by JF1OZL
I wanted to QRV on 14MHz SSB mode. I have known that 14MHz can be used for domestic communication. They made Japanese domestic QSO about 14.18MHz
http://www.intio.or.jp/jf10zl/14mssb10w.htm

A QRP SSB/CW Tranceiver for 14MHz by W7ZOI
Part 1: Exotic circuitry and hard-to-find components aren't necessary if you want to build excellent performance into a home-brew SSB/CW transceiver: Careful design is the key.
http://www.arrl.org/files/file/Technology/tis/info/pdf/8912018.pdf

A QRP SSB/CW Tranceiver for 14MHz by W7ZOI
Part 2: This moth, W7ZOI rounds out his description of a 1- or 10-W SSB/CW rig with details on its transmitter, TR switching and optional speech processor.
http://www.arrl.org/files/file/Technology/tis/info/pdf/9001028.pdf

A Simple Dual Band SSB Transceiver by VU2ESE
A dual-band transceiver with a crisp receiver and a clean SSB signal is described. It started its life as an investigation of the excellent S7C receiver described in EMRFD.
http://www.phonestack.com/farhan/xcvr1.html

A unique PSK transceiver, Version 2 by KD1JV
The original "unique" PSK transceiver proved that an efficient Class C power amplifier can be used to transmit PSK signals, although it requires a bit of front end circuitry to do so.
http://kd1jv.qrpradio.com/PSKV2/PSKV2.htm

Beta II - a 20m SSB transceiver by PS7PC
This transceiver is a new version of a rig published in AN-EP, a traditional brazilian Ham magazine of 1992, march / april issue by Carlão PS7PC.
http://py2ohh.w2c.com.br/trx/beta/beta.htm

BITX - An easy to build 6 watts SSB transceiver for 14MHz by VU2ESE
BITX is an easily assembled transceiver for the beginner with very clean performance. Using ordinary electronic components and improvising where specific components like toroids are not available, ..
http://www.phonestack.com/farhan/bitx.html

HF TRX with PTO based VFO by VK2ZAY
While surfing around the 'net I came across WA6OTP's website. Now I've seen PTO based VFOs before, but his implementation is very simple and elegant. I just couldn't resist the urge to build one myself and try it out.
http://www.vk2zay.net/article/45

My Homemade 20m HF SSB Transceiver by OZ2CPU
Output power is now only 4mW, from the Re-used input RF amp that also works as a filter, to only amplify the wanted difference from the mixer, not the sum.
http://www.webx.dk/oz2cpu/20m.htm

Taurus SSB transceiver by SP5DDJ
When Aquarius project became more popular many QRP-ers asked me if I could develop simple ( means duplicable) SSB version of low cost QRP transceiver.
http://www.qsl.net/sp5ddj/taurus%20eng.htm

The „Micro20 III“ – A Simplified Pocket Size SSB Transceiver for 14 MHz by DK7IH
After having built my first shirt-pocket transceiver about a year ago I occasionally thought of how this or a more or less modified design could be made simpler to save components and therefore limit space as well as reducing the complexity of the whole rig.
https://radiotransmitter.wordpress.com/2017/10/04/the-micro20-iii-a-simplified-pocket-size-ssb-transceiver-for-14-mhz/

Un transverter 50/21 Mhz de F6FEO
Utilisé conjointement au transceiver 50 Mhz décrit dans ces pages, ce transverter redonnera vie à la station 6 M non utilisée . Cela concerne notamment les longues périodes durant laquelle la bande est déserte.
http://f6feo.homebuilder.free.fr/transverter_50-21mhz.html