Kanban board (svg export) - look at the source! It has the original plantuml code

kanban_board.svg

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stroke-width: 1.5;" width="355" x="397" y="78"/><text fill="#000000" font-family="sans-serif" font-size="14" font-weight="bold" lengthAdjust="spacingAndGlyphs" textLength="41" x="554" y="94.5332">Doing</text><!--cluster stack_DONE--><rect fill="#FFFFFF" filter="url(#f1mw32h7d8bbss)" height="133" style="stroke: #000000; stroke-width: 1.5;" width="321" x="792" y="91"/><text fill="#000000" font-family="sans-serif" font-size="14" font-weight="bold" lengthAdjust="spacingAndGlyphs" textLength="37" x="934" y="107.5332">Done</text><!--entity Task3--><polygon fill="#FEFECE" filter="url(#f1mw32h7d8bbss)" points="73.5,132,83.5,122,332.5,122,332.5,202.8281,322.5,212.8281,73.5,212.8281,73.5,132" style="stroke: #000000; stroke-width: 1.5;"/><line style="stroke: #000000; stroke-width: 1.5;" x1="322.5" x2="331.5" y1="132" y2="123"/><line style="stroke: #000000; stroke-width: 1.5;" x1="73.5" x2="322.5" y1="132" y2="132"/><line style="stroke: #000000; stroke-width: 1.5;" x1="322.5" x2="322.5" y1="132" y2="212.8281"/><text fill="#000000" font-family="sans-serif" font-size="14" font-weight="bold" lengthAdjust="spacingAndGlyphs" textLength="75" x="92.5" y="156.5332">Task Name</text><line style="stroke: #000000; stroke-width: 1.0;" x1="73.5" x2="322.5" y1="159.6094" y2="159.6094"/><line style="stroke: #000000; stroke-width: 1.0;" x1="322.5" x2="332.5" y1="159.6094" y2="149.6094"/><line style="stroke: #000000; stroke-width: 1.0;" x1="73.5" x2="322.5" y1="161.6094" y2="161.6094"/><line style="stroke: #000000; stroke-width: 1.0;" x1="322.5" x2="332.5" y1="161.6094" y2="151.6094"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="207" x="94.5" y="178.1426">This is the first task of the board.</text><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="105" x="94.5" y="195.752">Not yet assigned</text><!--entity Task4--><polygon fill="#FEFECE" filter="url(#f1mw32h7d8bbss)" points="75,283,85,273,331,273,331,353.8281,321,363.8281,75,363.8281,75,283" style="stroke: #000000; stroke-width: 1.5;"/><line style="stroke: #000000; stroke-width: 1.5;" x1="321" x2="330" y1="283" y2="274"/><line style="stroke: #000000; stroke-width: 1.5;" x1="75" x2="321" y1="283" y2="283"/><line style="stroke: #000000; stroke-width: 1.5;" x1="321" x2="321" y1="283" y2="363.8281"/><text fill="#000000" font-family="sans-serif" font-size="14" font-weight="bold" lengthAdjust="spacingAndGlyphs" textLength="75" x="94" y="307.5332">Task Name</text><line style="stroke: #000000; stroke-width: 1.0;" x1="75" x2="321" y1="310.6094" y2="310.6094"/><line style="stroke: #000000; stroke-width: 1.0;" x1="321" x2="331" y1="310.6094" y2="300.6094"/><line style="stroke: #000000; stroke-width: 1.0;" x1="75" x2="321" y1="312.6094" y2="312.6094"/><line style="stroke: #000000; stroke-width: 1.0;" x1="321" x2="331" y1="312.6094" y2="302.6094"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="204" x="96" y="329.1426">This is the 4th task of the board.</text><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="74" x="96" y="346.752">Assigned to</text><text fill="#000000" font-family="sans-serif" font-size="14" font-weight="bold" lengthAdjust="spacingAndGlyphs" textLength="92" x="174" y="346.752">DEVELOPER1</text><!--entity Task5--><polygon fill="#FEFECE" filter="url(#f1mw32h7d8bbss)" points="94.5,434,104.5,424,311.5,424,311.5,504.8281,301.5,514.8281,94.5,514.8281,94.5,434" style="stroke: #000000; stroke-width: 1.5;"/><line style="stroke: #000000; stroke-width: 1.5;" x1="301.5" x2="310.5" y1="434" y2="425"/><line style="stroke: #000000; stroke-width: 1.5;" x1="94.5" x2="301.5" y1="434" y2="434"/><line style="stroke: #000000; stroke-width: 1.5;" x1="301.5" x2="301.5" y1="434" y2="514.8281"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="71" x="109.5" y="458.5332">Task Name</text><line style="stroke: #000000; stroke-width: 1.0;" x1="94.5" x2="301.5" y1="461.6094" y2="461.6094"/><line style="stroke: #000000; stroke-width: 1.0;" x1="301.5" x2="311.5" y1="461.6094" y2="451.6094"/><line style="stroke: #000000; stroke-width: 1.0;" x1="94.5" x2="301.5" y1="463.6094" y2="463.6094"/><line style="stroke: #000000; stroke-width: 1.0;" x1="301.5" x2="311.5" y1="463.6094" y2="453.6094"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="165" x="115.5" y="480.1426">Another task of the board.</text><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="136" x="115.5" y="497.752">Assigned to someone</text><!--entity Task2--><polygon fill="#FEFECE" filter="url(#f1mw32h7d8bbss)" points="440,132,450,122,728,122,728,202.8281,718,212.8281,440,212.8281,440,132" style="stroke: #000000; stroke-width: 1.5;"/><line style="stroke: #000000; stroke-width: 1.5;" x1="718" x2="727" y1="132" y2="123"/><line style="stroke: #000000; stroke-width: 1.5;" x1="440" x2="718" y1="132" y2="132"/><line style="stroke: #000000; stroke-width: 1.5;" x1="718" x2="718" y1="132" y2="212.8281"/><text fill="#000000" font-family="sans-serif" font-size="14" font-weight="bold" lengthAdjust="spacingAndGlyphs" textLength="48" x="459" y="156.5332">Task#2</text><line style="stroke: #000000; stroke-width: 1.0;" x1="440" x2="718" y1="159.6094" y2="159.6094"/><line style="stroke: #000000; stroke-width: 1.0;" x1="718" x2="728" y1="159.6094" y2="149.6094"/><line style="stroke: #000000; stroke-width: 1.0;" x1="440" x2="718" y1="161.6094" y2="161.6094"/><line style="stroke: #000000; stroke-width: 1.0;" x1="718" x2="728" y1="161.6094" y2="151.6094"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="165" x="461" y="178.1426">Another task of the board.</text><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="74" x="461" y="195.752">Assigned to</text><text fill="#000000" font-family="sans-serif" font-size="14" font-weight="bold" lengthAdjust="spacingAndGlyphs" textLength="158" x="539" y="195.752">Competent_developer</text><!--entity Task1--><polygon fill="#FEFECE" filter="url(#f1mw32h7d8bbss)" points="835,145,845,135,1089,135,1089,190.2188,1079,200.2188,835,200.2188,835,145" style="stroke: #000000; stroke-width: 1.5;"/><line style="stroke: #000000; stroke-width: 1.5;" x1="1079" x2="1088" y1="145" y2="136"/><line style="stroke: #000000; stroke-width: 1.5;" x1="835" x2="1079" y1="145" y2="145"/><line style="stroke: #000000; stroke-width: 1.5;" x1="1079" x2="1079" y1="145" y2="200.2188"/><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="207" x="850" y="169.5332">This is the first task of the board.</text><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="73" x="850" y="187.1426">Finished by</text><text fill="#000000" font-family="sans-serif" font-size="14" font-weight="bold" lengthAdjust="spacingAndGlyphs" textLength="133" x="927" y="187.1426">Another developer</text><!--link Task3 to Task4--><!--link Task4 to Task5--><!--link stack_TODO to stack_DOING--><!--link stack_DOING to stack_DONE--><text fill="#000000" font-family="sans-serif" font-size="14" lengthAdjust="spacingAndGlyphs" textLength="197" x="479" y="587.5332">"Kanban board for 2019.12.19"</text><!--
@startuml Kanban Board

caption "Kanban board for 2019.12.19"


rectangle stack_TODO as "To-do" {

    node Task3  [
        ** Task Name **
        ====
        This is the first task of the board.
        Not yet assigned
    ]

    node Task4 [
        ** Task Name **
        ====
        This is the 4th task of the board.
        Assigned to **DEVELOPER1**
    ]

    node Task5 [
        Task Name
        ====
        Another task of the board.
        Assigned to someone
    ]

Task3 -[hidden]- Task4
Task4 -[hidden]- Task5

}

rectangle stack_DOING as "Doing" {

    node Task2 [
        ** Task#2 ** 
        ====
        Another task of the board.
        Assigned to **Competent_developer**
    ]

}

rectangle stack_DONE as "Done" {
    node Task1 [
        This is the first task of the board.
        Finished by **Another developer **
    ]

}

stack_TODO  -Right[hidden]- stack_DOING
stack_DOING -Right[hidden]- stack_DONE

@enduml

PlantUML version 1.2019.09(Mon Aug 26 18:19:51 CEST 2019)
(GPL source distribution)
Java Runtime: Java(TM) SE Runtime Environment
JVM: Java HotSpot(TM) Client VM
Java Version: 1.8.0_112-b31
Operating System: Windows 8.1
OS Version: 6.3
Default Encoding: Cp1252
Language: es
Country: ES
--></g></svg>

Take a look at the SVG source code.
It contains the original .plantuml code that produced this diagram :-)